I have a Harbor Freight 44991 Mini Mill that I bought in 2006 or there abouts. My use of it has been off-and-on depending on what projects I had. Lately, I’ve been using it a lot and happened across a blog post talking about the benefits of upgrading from the gear drive to a belt drive using a mini mill belt drive conversion kit from LittleMachineShop.
There were two benefits that really caught my attention. First, I’d read that one of the key gears was nylon and could break. It hadn’t happened yet but given my machine is around 18 years old, it was concerning. Second, it could take care of the annoying loud whirring gear sound. I’d lived with it but I knew exactly what the author meant.
A company name Sieg in Shanghai actually makes these mini mills and they are sold under many different brands so if you have a Mini Mill from Harbor Freight, Grizzly, Micro Mark, Norther Tool, Sieg, Travers Tiiks, Wen and more, this ought to work. They tell you to confirm that the rear shaft is 9mm with a 3mm key and the front pulley that will go on the spindle has a 30mm bore and a 5mm key.
LittleMachineShop is my goto source for parts for my little mill and I aways had good luck with them. Overall, folks spoke highly of it so I ordered direct from them so I could get faster shipping. You can also buy it from Amazon if you prefer also [click here].
What arrived was a neatly done little kit with all the parts you need. A few people left comments on Amazon that they didn’t like the maching but what arrived for me was just fine.
This box was in another box – everything was packed very well. Note the small drive belt they include in case you ever need another. Gates 0130 or 2L130.This is the pully for the motor.This pully will go on the spindle.
Now, before you do anything read the instructions from their website. They also come with the kit and were on the bottom of the box. I through them one by one and found them to be detailed and accurate. There are a number of steps so I am going to post photos only of some of them – follow their instructions and you can do this.
They tell you this can be done in 15-20 minutes. It took me just over an hour as I had to fight to get the pinion gear off the motor because I couldn’t find any of my bearing/gear pullers so I blew time trying to find them and then making do with what I had.
So that’s the nylon gear everyone talks about. It connects to a steel gear on the motor (what could possibly go wrong). The nylon gear spins and sends power down to the Hi/Lo gear. The mill speed is set to high, you remove that gear and a snug fitting piece of clear tubing is put in its place just to keep the now-gearless shaft from falling. I found disassembly very easy until I got to this gear. The instructions say it may be tight. Well, it’s definitely a tight interference fit. Every fastener came off surprisingly easily but that gear is a pain.What would have made quick work of this would have been a bearing/pinion gear puller. Guess who couldn’t find his …. anywhere! So, I got a 17mm box end behind and levered it out part way and then used a big flat head screwdriver where the head was bevelled. I’d lightly tap the screwdriver down and as the wedge-shaped head moved down, the gear moved out. I just had to be careful not to lose the Woodruf key that holds the gear in place relative to the shaft. I was able to slowly work it out. The only causualty was knocking paint off the motor as it moved around.My pile of parts grew. I like using a magnetic tray to hold everything. I scooted everything left over into a heavy ZipLoc type bag and stored it in my mill’s toolbox.
I kept following the instructions and everything went together real easily. I’m actually impressed that they were clearly described and complete.
Now there was one catch – they told me to use my old spindle lock pin when I was putting the spindle nut back on. Maybe there’s been a design change in the 18 years since I bought mine but my original spindle lock was 7.865mm and far too big to go in the new top plate’s hole. I found I could get a handy roll pin punch (6.42mm) to fit albeit with a little slop in the locked spindle. My original spindle stop pin had a diameter of 7.865mm according to my Mitutoyo micrometer. I used some drill bit shafts to get an idea of the size rod I needed. 6.5mm fits through the hole and is about as large as I can go. I toyed with filing the hole open larger to fit a bigger pin but think this will hold up ok. It doesn’t have to withstand a lot of torque.Here’s a side view. Note the paint scuffed off the black motor from my hear removal shenanigans. Note hole for the locking pin.Looking down at it a bit.With the cover.
Summary
I can’t say that the sound level went down much but it did change. More of a whirring sound instead of the gears meshing. Running at max speed on the low speed pulley, my sound meter is reading 90-92db while sitting on the table right below the spindle.
For me, the most important thing is that I don’t have to worry about one of the gears breaking. I’m pleased with it because that was what I really cared about.
If you want to upgrade your mini mill so you don’t have to worry about the gears, The LittleMachineShop belt drive conversion kit is pretty slick.
I hope this helps you out.
Note, I have to buy all of my parts – nothing here was paid for by sponsors, etc. I do make a small amount if you click on an ad and buy something but that is it. You’re getting my real opinion on stuff.
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at in**@ro*********.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.
We bought our home in 1998 and it came with a 20×40 in-ground pool. Here we are 26 years later and I will tell you that a pool is way more maintenance than you think if you’ve never had a pool. We have tons of great memories of the kids growing up, pool parties with them and family visits that have made it worth it. These days, the hardest thing for me is the routine cleaning of the pool because it takes so long. It could take anywhere from 30 minutes to two hours depending on how dirty it was because I didn’t have time to keep it clean continually. I have to balance a day job, my own business and family — that doesn’t leave time for pool cleaning.
This past spring (May 2024), before we even opened the pool, my wife I are started wondering if a pool robot might be worth it because I just do not have the time any more to do it. We’d dismissed this in past years due to the cost. Well, it was time to revisit that.
Prices had dropped a lot and there were tons and tons of options on Amazon. There are pool robots out there with all kinds of price points and we paid close attention to the size pool the manufacturer said they could handle and what angles. The last part mattered because our pool has a 3-4′ shallow end and then about a 9′ deep end with an angle at the transition between the two and angles near the bottom of the deep end. We also wanted it to be battery operated.
After reading a many, many reviews and visiting websites, we decided to buy the 2024 edition of the Seauto Crab [click on this link to open the listing at Amazon in a new tab]. At the time, with a coupon applied and taxes added in, the total was $423.99. It may seem like a lot of money, and it is, but there are far more expensive robots out there and we had to do something. In checking the pricing now, it’s $359.99 before tax with free shipping.
This photo was from June 24th – I just put the robot in the pool. The treads on the left and right of the unit move it. There are black rubber wheels with flaps on them both front and rear that do the cleaning and push debris towards the inlet. The blue LED shows it is on and charged. My best guess is that the two silver “dots” just below the blue inverted “U” are sensors that tell the unit if it is submerged or not. It will not turn its electric motors on unless it is underwater and also tell it when its out of the water when cleaning the side walls of the pool.
Now, most robots get very mixed reviews and the Crab was no different. My strategy was to order it, put it to immediate use and rely on the Amazon warranty. If you have an electronic device, the odds that it will fail are the greatest within the first 30 days statistically so use the heck out of it and find out. Absolutely do not let it sit in the box – put it to immediate use. Amazon will back you up if there is a problem in those first 30 days.
I timed the purchase so we would get it, charge it and drop it in the pool. There was a few day delay when UPS accidentally routed the box to Texas and then set it back to Michigan but it was delivered on June 17th and was first dropped in the water on the 18th.
We had just opened our pool and did the initial vacuuming but it was still pretty messy. I was charging and deploying the Crab 2-3 times per day for the first week. It tapered off to the point where I now do it daily – by the way, I am writing this on August 9, 2024.
The pool was definitely a mess. I’d drop in the crab, let it run until it shut down, charge and do it again. This photo was taken on June 18th at 5:24pm.This is on June 19th at 7:28am. It was just getting ready to drop it in the pool. It had probably run 1-2 cycles at this point.June 20th at 12:27pm. Probably 4-6 cycles at this point.June 26th at 3:52pm. Most of the debris was gone. Some of what you see were patterns on our pool liner. I did not do any vacuuming or use of a leaf bag. This was all the robot. In fact, I have not vacuumed the pool since we bought the robot. I did occasionally use a leaf bag use for small branches or to clean maple leafs off the surface. I also have brushed algae of spots on the wall twice but nothing like the old days.June 15th at 6:50pm. The pool was in amazing shape. We have a big maple tree nearby and leaves drop in the pool. Eventually they sink and the crab picks them up.June 24th – one of the funniest things during the first couple of weeks was watching one our dogs watch the robot. This is Hercules – he ignores it now but he just couldn’t figure out what it was. It sure startled him the first time it came up out of the water doing a wall 🙂
I did some math and we’ve used it 53 days now and well over that many times so maybe 75 times on average let’s say. As I am writing this blog post, it’s out there doing its job cleaning the pool and our pool has never been this clean.
The pool is amazingly clean. The bottom has never been this clean – ever. I’m very impressed.
Let’s Get Into Some Details
The unit arrived fully assembled and consists of the Seauto Crab unit, a charger and a retrieval hook that goes on your pool pole – assuming you have a standard full size pool pole. All you need to do is charge the unit for the first time. The top LED will turn blue when charged and then turn off after a few minutes.
The manual is a quick read – no huge insights but it does help you learn more about the unit and what the color codes of the top LED mean.
When you plug in the charger, a light on the unit turns red and goes out when it is done. The unit will run about 2-2.5 hours on a charge. The overwhelming majority of the time at least, it gets near a wall and shuts itself off. I don’t know if it’s by luck or design but I can only think of one time out of 75+ cycles where it was towards the middle of the pool. It makes retrieval with the pool pole and hook very easy.
This is how I find it most of the time when I go out and check after a few hours. The LED on top has changed from blue (charged) to red (discharged) and it usually stops by a wall. I have to think this behavior is programmed as it almost always stops by a wall – not the same spot but by a wall somewhere in the pool.I’ll find it in the pool with the red light on. I’ll pull it out, spray it off, clean the filter basked and then hook it up to charge in our pool shed.
There is an app for it and it let’s you set the speed of the robot and whether it just does the floor, walls or both (All cover mode). When we first started cleaning the pool, it was pretty dirty on the bottom so I set it to slow and floor only with the app each time – it doesn’t recall the setting.
The app connects to the robot via Bluetooth and it doesn’t take very much water to block the signal so I would set it before I put it in the pool. Now, I just drop it in the pool in all cover mode.
I should point out a reason you need the app – once or twice it has automatically downloaded and installed a firmware update to the Crab. Obviously there’s some type of computer in there.
It actually does a really good job cleaning. Debris is sucked into the bottom and filtered through a very fine mesh basket. If there is something that will not fit in the bottom slot, it’s not going to be able to pick it up but that thing vacuums up all kinds of stuff. If the baskets gets plugged up, I imagine it would no longer be able to clean but I didn’t encounter that – maybe at the start but not that I can recall.
I honestly did not know what to expect. Did it have sensors? Would it move in a grid? Did it know where it had gone? Well, it does its job through random motions. It can’t do our entire pool and the walls in one charge. When the pool was really dirty, I could see it was making progress each time. Now, it is maintaining everything.
It’s fascinating how it does walls. It has a thruster (enclosed propellor) on the top. It turns on, the Crab engages it’s tracks and it goes right up the pool wall. There are sensors on the top that tell it when it has gone out of water and it goes back down. When it first did it, one of our dogs just did not know what to make of it and stood on the edge of the pool a few feet away just watching it.
The robot is using its thruster and going up the wall while scrubbing it. Another perk of all this activity is that it really keeps the water moving around and we have fewer spots of warm vs cold water plus the chlorine gets around better. It seems like we have less algae than in the past. I had to solar copper ionizers last year also. The only difference is the robot. I still have to put a brush on the pole but it happens a lot less – maybe only twice so far this season have I needed to brush off algae starting in some spot.
Somehow, the thing remains upright. I carry it by the handle and place it in the water. It sinks down and engages its thruster – maybe its orienting itself I am not sure. If it is clipping right along and goes down the decline into the deep end, it actually pops a wheelie with the front of the crab lifting up slightly as the unit propels itself downward with the rear tracks and flap wheel.
I will set it down in the water and it slowly sinks evenly to the bottom. Once there, it kicks on its thruster – maybe as a test or something – and off it goes. I have never found it upside down in all the cycles that I have run it.June 19th – the crab only had this happen once. It was cleaning the steps and got stuck. It you notice, the top is pointing at a back and downward angle. I want to say the app downloaded and applied two firmware updates since we bought it – definitely one for sure – and this has never happened again. All I can guess is that either Seauto discovered this situation and fixed it themselves or they got feedback from customers. It still regularly does the stairs so it’s not avoiding them – it just seems to be able to navigate them correctly now. Hercules, our dog who was the most curious about what was going on, had no idea what to make of the robot.
I should point our locomotion is via a rubber track/tread (like a bulldozer or tank) on each side. There are flap wheels in the front and back that are cleaning the surface and funneling debris towards the inlet where the filter basket is at.
Like I said earlier, it runs until power gets low, seems to almost always stop by a side and I fish it out. You take the clear top cover off and then the cover of the filter basket. I use a hose and water to clean the mesh filtering basket and spray the debris into a bucket. I then toss the water and debris into a corner of the yard. It takes less than five minutes to clean everything. I do like to rinse the unit off so the chlorine contact is lessened. Chlorine is an oxidizer and it will take its toll on plastics and rubbers over time.
These next photos may make it look like it takes a lot to dump the filter and clean the crab but I can pull it out, clean it and start it charging in less than five minutes. The first thing you do is flip out and down the grey tabs on each side of the clear outside housing. By the way, these next photos are from a few different cleanings taken at different times so there are different amounts of debris in them.Next you are looking at the actual clear cover of the filter. Yes – two covers – the outer one and the filter one. To remove this, lightly press on the black tabs on the left and right that are sticking up and lift up. Sometimes I have fine sand sitting in the depressed areas on top of this cover and I just hose the cover off. Actually, I always hose the unit off during each step of disassembly to both get rid of any debris and to get the chlorine off the plastic.This was on July 16th. We had quite a storm and there were a lot of leaves that had fallen in the pool and sunk to the bottom. The unit can scoop up quite a bit assuming the debris can fit in the intake slot on the bottom.This is from a cleaning on July 15th. I wanted to point out the rubber flap on the bottom. Water and debris are pushed up and the rubber flap bends open to let them in. When it stops, the rubber flap closes trapping the debris inside. There have been a few times, not a lot, where something had prevented the flap from fully seating so when I pulled the unit out of the water I could see some debris sinking down as the water drained from the unit.The filter basket is a fine mesh. It even traps sand.I rinse the filter basket out and have the water and debris drop into an old chlorine bucket. It doesn’t take much to get it all out. I cleaned the bucket before cleaning and then after so you could see the sizes of various debris it picks up. I’ve had a few times where a small end of a branch with leaves on it falls in and the unit can’t pick that up but it’s the exception thankfully.Some fine sand gets caught inside and I just rinse it out while I rinse off the unit overall. The yellow you see on the burgundy deck stain is sand from prior cleanings.
I did find one small issue – the clear top outer cover doesn’t readily just go into place on our unit. You never want to force or whack plastic into place because eventually it will snap. I found a workaround – If I put the cover on and stop just short of all the way down and lightly pull the left side outwards, it goes right on without forcing. It might just be our unit that has that issue but that’s the only “trick” I can think to pass along.
I then put the unit in our pool shed on a plastic bin that just happens to be there and plug the unit in to charge. I think it charges in about three to four hours – I’ve never stopped to really time it.
That’s it. I’m perfectly happy with it and so is my wife. She’s actually given it a pet name of “Flounder”. I usually call it the pool robot still but she and the kids now call it Flounder … ok, whatever works 🙂
In looking at reviews on Amazon, I’d take them with a grain of salt. I never expected artificial intelligence, a miracle worker or a $400 robot compared against a $2,500 robot. I also knew that I needed to put it to immediate use and that it might fail – it didn’t. If it had, I would have worked directly with Amazon to get a refund. I didn’t need to.
How long will it last? I honestly don’t know. I will rinse it down and store it indoors when Winter comes and we’ll see next Spring. We still have until late-September when we close the pool for the season. If something changes, I’ll update this post.
Would I recommend the unit based on experience? Yes, I definitely would. You have to understand something – our pool has never ever been this consistently clean. I still have to add chlorine, keep the water chemistry in check, clean the copper ionizers and the skimmer but my time vacuuming has gone away – I haven’t vacuumed once since we bought the crab. I have used a leaf bag on the pool pole a few times but boy did I free up time and get a clean pool.
I use it once a day now to maintain the pool and the results are amazing. I’m so busy that if I do anything it comes at the expense of something else. I can make the time to put it in the pool (2-3 minutes) and then pull it out, clean it and hook it up to the charger (less than five minutes) for results like this.
Summary
Our experience with the Seauto Crab 2024 edition has been great. I would even use the word “amazing” to describe the unit. If you want to cover yourself, buy it off Amazon (I did), run the heck out of it and if there is a defect, it will probably happen in the first 30 days while Amazon’s warranty coverage is still active.
If you’re looking for a $350-400 price point pool robot, it’s doing a great job for us. Hopefully you will have the same experience as us.
I hope this post helps you out. To be clear, I wasn’t paid to write this and have no affiliation with Seauto. I’m sharing our experience with the crab and if you want to buy it from one of the Amazon links on this page then great – I’ll get a small commission and want to be clear that I wouldn’t write this if it was a disappointment.
Note, I have to buy all of my parts – nothing here was paid for by sponsors, etc. I do make a small amount if you click on an ad and buy something but that is it. You’re getting my real opinion on stuff.
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at in**@ro*********.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.
I have a Harbor Freight 44991 mini mill that I bought it in 2006 if I recall right – it’s been so long that I don’t actually remember at this point. It’s served me well but like anything, stuff happens with age. In this case, the mini mill way covers were breaking down due to oxidation and repeated flexing.
I’ve replaced the way covers a few times over the years but this time had a challenge finding any in stock. In general, my goto spot for mini mill parts is LittleMachineShop.com and I recommend them to anyone with a mini mill or lathe. They’ve been out of stock for a while now and I wanted a solution sooner instead of later. I was adjusting my mill, cleaning it up in general and wanted to get the covers on so the ways would stay clean.
If you are new to machining, way covers aren’t just cosmetic. They keep debris off the ways (the machined surfaces that move on the X-Y table). If you don’t keep the ways clean you run the risk of something getting under the table and throwing it off or even just making cranking the handles harder.
So, I needed to find another source but where? I had to figure out an alternative. Way covers have a diameter and length – how hard can it be if I searched using the measures and adapted whatever I found? The answer is that making your own is surprisingly easy. The way covers for the 44991 mini mill, and the two dozen or so brands that are actually the same machine made by Sieg in Shanghai, are 200mm wide and that’s the key – looking for millimeters vs. inches.
My initial mistake was to try and find a cover with a width between 7.75 and 8 inches. Then it dawned on me that the machine’s parts are actually metric and the width was 200mm. I figured if I could find a long enough length I would just cut it down and that strategy worked. By the way, that’s a 12″ IGaging Absolute Origin caliper. It’s a rare job where I need to measure something bigger than my 6″ Mitutoyo caliper can handle. For those rare occasions, the IGaging caliper has been good enough for me.
Armed with that, I immediately found way covers on Amazon. They are really long but you can cut them down with a plain sharp knife and straight edge no problem. Click here for the listing. At the time of purchase, they had one review. I was in a rush and figured I would gamble $10.19 not including a 5% off coupon. It was shipped from China and took about two weeks to arrive.
Guess what? They are actually really decent. Instead of rubber, these way covers are some kind of rubberised fabric. I’m not even sure rubber is the correct term and cutting them down to fit is fast and easy with plenty left over for a few more replacements (I stored the remainder in a heavy ziploc industrial bag and actually purged it with nitrogen. Yeah, I work with plastics so I have access to that stuff. Just sealing it in a good ziploc-type bag and keeping it safe would probably work too.
Let’s Step Through The Process
I did my covers one at a time starting with the front. The cover is held in place by a bracket on each end. Each bracket is held in place by two Phillips round head screws. Remove the brackets and the covers. Note the front cover has two sizes of screws when you go to reassemble it.
Each way cover is held in place by a metal strip and two Phillips round head metric screws. Note, on the front way the front and back screws are two different sizes so pay attention what goes where (the larger diameter screws are to the back if I recall correctly). This is either my second or third set of rubber way covers. They slowly break down with time and use.
With the cover off, I cleaned and lubed the ways and also the threaded rod. I then moved on to make the cover.
I removed the front cover and took the time to clean and lube the ways and threaded rod.The old way cover is to the right. The 200mm x 1500mm new way cover is to the left. It turns out the folds are 1.5cm on both so I just counted the peaks and made my cut. If the fold height didn’t match then I would have fit it based on the smoothed out length.I cut the length of new cover I needed and then used the old brackets to mark the hole locations.I marked the holes and then used a revolving hole punch plier to approximate the openings. I actually own a hole punch set but I don’t know where I put it – that would have been more elegant than my nibbling around the circle with the pliers but I got the job done.
I then did the same for the back and installed the way covers on the mini mill. The next time I do them, I may glue a plastic strip on each end to make it a tad more secure at each end but what I have is working great.
Looks much, much better and the ways are once again protected. It’s a tad floppy at the ends and next time I will add either a small steel or plastic strip the full width of the cover, scuff both sides for a good grip and join them with Starbond black super glue. The cover is perfectly serviceable as-is for now but am keeping that in mind for the future. By the way, that is a Dayton CNC 12″ workholding plate. I have two of them and they’re great. Here’s the link and the wait time is about 2-4 weeks. The positioning strips are from a vendor called Bulk Man 3D on AliExpress. All the holes and fasteners are 1/4-20 and the metric strips can accomodate 1/4-20 socket head screws in case you are wondering.I’m not sure what this material is but have a suspicion it will hold up better than the rubber. Time, use and exposure to lubricants will tell though. I’ve only had them on for over a week but cutting oil and penetrating oil don’t appear to have affected the material thus far.
Summary
The new way covers are working great. You can make your own and have plenty left over for the next time plus it is cheaper regardless. I have no problem recommending you buy this way cover and cut it to fit. I do suspect it will hold up better than rubber given it is fabric reinforced and not just plain rubber and we’ll see if that proves to be true.
I hope this helps you out.
Note, I have to buy all of my parts – nothing here was paid for by sponsors, etc. I do make a small amount if you click on an ad and buy something but that is it. You’re getting my real opinion on stuff.
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at in**@ro*********.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.
Do you have an old HK grip, or any other plastic item, you want to rejuvenate? Or maybe you bought one of the contract grips, washed it and now it’s a dull grey and all of the scratches stand out and you want to make it look better? It’s easier than you might think.
Clean the grip
I recently boought a bunch of the the surplus HK33 “contract grips” that were made by SME Arms and Ordnance manufacturer, Malaysia under license from HK and most of them really needed cleaning – everything from cosmoline to brown masking tape with numbers were on them.
The first thing is to really clean the grip. I use a Vevor 30L ultrasonic cleaner[click here for a review I did on mine] with Simple Green HD and water in it but you can use any warm-to-hot soapy water and something to scrub with to clean it up. Use compressed air to blow it dry real quick before any exposed steel surfaces rust.
These HK33 grips are a mess. Most are beaten up to some extent. Many were covered in cosmoline – that grip on the top that is shiny is coated in it. Some even had old dry masking tape wrapped around the actual hand-grip portion.
If you aren’t interested in ultrasonic cleaners, you can also have very good luck with hot soapy water. I used to recommend brake cleaner but that has really lost its cleaning power as various regulations have really reduced its strength.
This is a 30 liter Vevor ultrasonic cleaner filled with Simple Green Pro HD heated to 158F (70C). It gets rid of pretty much everything in 15 minutes including most if not all of the paint in the lettering.
Dealing with scratches and small nicks
Major repairs can be a challenge. Filling them with black epoxy or black super glue creates visible repairs. Black super glue to close a clean crack works surprisingly well. Starbond makes a black super glue that is superb at closing cracks plus bonding clean surfaces together in general – click here to see it at Amazon
For minor scrapes and scratches, the best approach I have found is to use 0000 (sometimes called “quadruple ought” or super fine) steel wool and vigorously rub down surfaces to get rid of scratches and any plastic sticking up from getting nicked. The benefit I have found with it vs. sandpaper is that it doesn’t destroy the surface finish as easily.
This is an actual HK German SEF grip converted for use on an MP5K. I used 0000 steel wool to knock over any sticking out plastic and reduce minor scratches. I find careful use of steel wool helps me improve the surface some without destroying the pebbled finish on the plastic.
Restoring the black color
Black plastic fades as the surface layer loses its oil/moisturizers. The trick to try and replace those lost chemicals and bring the color back.
Black plastic that has been ultrasonically cleaned is greyish and you can see all of the scratches. If you don’t know it’s coming you can have a “what just happened” moment.
The treatment I use is made by Car Guys and is called “Plastic Restorer”. Again, make sure the grip is clean and then rub this stuff in. I use nitrile gloves and work it in. You want a thin film there. I let the stuff sit overnight and buff it off with a shop towel the next day. It does a nice job and will last for sometime. I’m not exactly sure how long – I’ve been using it for almost six months and nothing has faded yet.
On this HK SEF grip, it’s been cleaned and I used steel wool to knock down any rough spots. Next up is applying Car Guys Plastic Restorer.The actual cream that comes out is an odd blue grey color. I wear nitrile gloves, put the cream in my glove and then apply enough to leave a film. It does need to have a light film – not super thick but something like this. It has to sit to work, I try to let it sit overnight if I can. They say at least 10 minutes but I find the longer the better. You then wipe it down and remove any residue on the surface,This is the same grip. It sat overnight and then I wiped it down the following day.Same grip – other side.These are four of the grey ashen grips shows above after following this process.Same grips – the other side.
Summary
I did not know why black colored platics fade with time. Now I do and the Car Guys Plastic Restorer works on more colors than just black. Click here for it on Amazon – there’s a reason there are over 31,000 reviews and a score of 4.4. It’s that good. So, whether it’s plastic on firearms, cars or something else, this stuff might really help you bring the color back.
One perk is that it does seal and provide UV protection after it is applied. I’ve been using it for six months and nothing has faded yet but then again, no finish lasts forever so I would bet that some day I will need to touch things up.
Note: This stuff isn’t for headlights and it doesn’t fix physically damaged plastic when there is a thick crust of oxidation or scratches. It’s meant to bring the color back is all.
I hope this helps you out.
Note, I have to buy all of my parts – nothing here was paid for by sponsors, etc. I do make a small amount if you click on an ad and buy something but that is it. You’re getting my real opinion on stuff.
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at in**@ro*********.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.
There are some things I like on MP5Ks and some things I don’t. I usually dislike the triggers but my MKE AP5-P has a fairly decent trigger as MP5 and MP5Ks go. My MKE also had a factory contoured grip. Of all the HK grips out there, the contoured is the one I like best but there is one I like even more – the “Magpul SL Grip for HK94, HK93, 91 and Semi Shelf Clones”. That one heck of a long product name – just remember the model – MAG1070-BLK.
This is the Magpul “SL Grip Module for HK94/93/91/MP5 & Semi Shelf HK Clones” – Model MAG1070-BLKZenith ZF5-P. Very nicely made pistol. Relatively bland grip.Century Imports’ MKE AP5-P. It’s excellent. I like the contour grip more but that’s a personal preference.
A few months ago, I installed one on my Zenith ZF5-P and really liked it. Whereas the MKE has a contoured grip, the Zenith has a basic straight grip that is only slightly more ergonomic than a rounded rectangle. I’d read a few posts about guys converting over the Magpul grip, so I did the same. You know what? I realy like it.
Here it is on the Zenith. By the way, that is Magpul’s cool ESK Extended Selector Lever. I have links to them at the bottom of the post.Here’s the second one on my MKE AP5-P.
Doing the Conversion
The Magpul SL grip wasn’t designed for use on a MP5K but what you need to do is pretty straight forward if you have the tools and at least some basic knowledge of locating holes to be drilled.
Let’s go over some basics – first off, the steel “tail” that sticks out of the Magpul will need to be cut off. I’d recommend using something like a hacksaw, reciprocating saw or a bandsaw. I have a metal cutting bandsaw so I used that. Please notice I did not list a Dremel or similar rotary tool with an abrasive wheel. They risk making the steel so hot that the plastic could be damaged.
The first step was to cut off the tail. I did it flush with the end of the plastic and cleaned it up with a belt sander.
Next, sand the tail end smooth. Take off as little material as possible as it will help you get a solid lockup.
Take off as little material as you can until the grip fits and the end cap, brace or stock can fully seat. By the way, I should have cleaned up a bit more before this photo – the dust you see if from me sanding Hungarian Grey-Blue AMD grips that we make. The dust is not from the Magpul grip – it will be black flecks of plastic and a bit of metal from the steel reinforcing channel inside the rear.
As you may have noticed, many MP5K-type weapons, such as those from MKE and Zenith, use two small pins to retain the grip assembly – one in the front at the bottom and one in the top rear. With the semi shelf and a snug fit, you just need the single rear pin to hold the grip’s rear end up and in place.
The front of the grip has a plate that interfaces with the semi shelf on your MP5K. Magpul includes instructions for SP5 owners that they may need to remove a little material for a good fit and I would assume this extends to the SP5K but I don’t know this for sure. With both my MKE and Zenith, no adustment was needed.
That little rectangle welded just to the right of the front grip pin hole is the semi shelf.This is the locking plate for the grip that interfaces with the semi shelf at the bottom slot in the photo (if the weapon were held upside down, it would be the slot at the top .)
In terms of locating the hole, take your current grip and measure backwards from the front locking plate to the center of the hole. Then, measure down from the top of the grip. Use these two measures to locate where you need to do your cutting and then setup your mill accordingly or at least a good drill press because all you are doing is plunge cuts.
Measure the hole from the locking plate to where the center of the hole is on your existing grip – this is the horizontal measure. I’d recommend using calipers to do this. You then need to do the vertical location by measuring from the top of the grip to the center of the existing hole. The more precise you can be, the better your results will be.
Cutting the rear hole.
Critical: You must make an insert from hard wood, plastic, or aluminum. If you don’t, the walls of the grip will flex and your holes are going to be a mess. I learned this the hard way. The width left to right is about 7/8″ and then you can decide how you want to handle the vertical. I’d recommend surrounding the area where you want to make the cut. I run my insert the whole length of the inside top to provide a firm support both for the clamps and the plunge cuts. You don’t wany anything to flex.
If you don’t have an insert to keep the grip open, they will flex as you attempt to cut them and you’ll make a mess. This is 7/8″ left to right. I then made it the length I wanted. The “leg” on the left bottom is to help it stay in position in the grip. The hole on the right shows you where the 6mm end mill plunges into it.
The first step is to cut the reliefs where the pin goes. The head of the takedown pin is about 9-9.1mm wide. A 9.5mm cut doesn’t give you much room to adjust. 10mm is just a tad wider and gives you more room to adjust your cuts later with a circular file and not have the head unable to sit down in the recess. The reliefs need to be cut about 3mm deep.
That is a 10mm end mill and I just finished a 3mm deep cut. A 9.5mm head would give you a tighter fit around the head of the pin but 10mm gives you some adjustment room.
Next is to cut the 6mm holes for the pins. I’d recommend against a drill bit as it might get squirrely on you – both in terms of deflection or the bit getting caught on one of the holes in the steel reinforcement. Get a 6mm carbide end mill, make sure your grip is held securely and do a plunge cut.
A 6mm end mill was used to plunge cut the center hole for the pin.Here is the MKE Pin with an OD head diameter of 9.1mm. The countersink was cut 10mm wide and 3mm deep. This gives a bit more room for adjustments.
If you do use a drill press, check your runout. If you have more than 0.5mm on one side, you risk cutting to big of a hole. You want to be somewhere between 6.0 and 6.1mm. If you go too wide, the retaining wire may not get a good enough hold to keep the pin in place.
Cleaning Up
Use a fine file or diamond abrasive stick to remove all material left over from cutting inside the grip so you have a smooth surface.
It’s time to test fit the grip. It may go in great all by itself or you may need to adjust it just a tad with a circular file. I’d recommend a 6mm tapered circular file so you have a lot of control.
This 6mm tapered Bahco file is great for adjusting holes. Click here to see it on Amazon.Use a circular file to adjust the grip until it fits. Don’t rush – take off a bit and test, take off a bit and test until it fits. That is the Bahco 6mm file I mentioned earlier. It’s great for this kind of work.
Note, test fitting the grip by itself is one thing. Doing it with the stock, brace or endcap in place is another. You may find further adjustments with the circular file are required. Also, you can make things fit sometimes by moving or tapping the grip or whatever is on the end around. The sheet metal of the receiver can flex and sometimes it gives you just enough alignment to push the pin on through. I often tap (not bang) them in with a small hammer with a non-marring head.
You want everything to be snug. You’ll find the front pin doesn’t matter if everything is tight. If you really want a front pin, you would need to make a custom pin given the width of the Magul’s front lower “ears”. It would also only be cosmetic because you would be inserting a steel pin into soft plastic that does not have a reinforcing plate.
The moral of the story is to keep the front-to-back length of the grip long so it is snug – again, don’t cut or sand off more of the black plastic than you must. Also, try to be as close as you can with the pin holes at least vertically. Because of how the grip is sandwiched between the mag well and whatever is on the rear, it’s not going anywhere. The rear pin is the final part to limit movement.
I used the file to slot the hole backward just a bit. Note how tight the grip is up against my SB Tactical brace. It’s not going to wiggle.
The Results
The MKE feels great. I will upgrade the selector the Magpul ESK but even with the stock MKE selector I like the feel more.
Summary
I hope this helps you out if you want to do this yourself. For folks who just want to do the final filing adjustments, we will converted Magpul grips for sale. Please click here to go to our store.
Here are the original Magpul grips in case you are looking for them:
Production Grip Comment
For our production grips. the holes are based on a new unissued German MP5K grip. Depending on a bunch of factors, the exact holes in the grip you get will vary a bit. Fitting will be required – front to back and the hole locations.
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at in**@ro*********.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.
If you are looking for an extended selector lever for your MP5 or MP5K, these are really nice.
I hate bad triggers and the worst triggers I have ever used were on HK MP5 and MP5K weapons. I have no idea of the design intent – maybe a real strong emphasis on avoiding an accidental discharge by having a long spongy pull and then a break somewhere around eight pounds. For someone who likes crisp triggers and a lighter pull, the HK triggers in general can be a rude awakening.
I recently picked up Zenith Firearms ZF5-P, which is a MP5K clone. Zenith Firearms is based in Afton, VA, and make their various rifles and pistols there. They used to import MKE clones from Turkey but severed ties and are actually making them here in the US.
I bought the ZF5-P for a few reasons – First, I got a good deal on it. That always helps. Second, I no longer had any form of an MP5 and kind of wanted to get back in. Third, and the subject of this story, I knew Timney made a well-regarded trigger pack for the MP5/MP5K. Fourth, I had an urge to tinker and needed a test platform.
Now Zenith makes a big deal that they machine their cartridge walls vs. bending sheet metal resulting in a better trigger. I was kind of curious to check that out as well.
For the rest of the article, I’ll just refer to the trigger as an MP5 trigger because the MP5 and MP5K share the same trigger pack. It’s the grip that differs.
The Zenith’s Original Trigger
Well, I was hoping for a good trigger out of the box because of Zenith machining the walls of their trigger pack but to be honest, it was just another MP5 trigger. I bought a new Century MKE AP5-P and its trigger was better than the Zenith’s also. It’s not that the Zenith’s trigger is bad – my point is that the unit I received was no better than any other MP5 trigger I’ve used.
I used a Wheeler “Professional Digital Trigger Pull Gauge” and did 10 pulls of the trigger after lubrication plus I had pulled the trigger maybe two dozen times since I bought it so there was a tad bit of wear in before testing. At any rate, the lightest pull was 7 pounds 5.9oz. The heaviest was 7 pounds 13.5 ounces and the average came in at 7 pounds 11.3 ounces. So, just shy of 7.75 or seven and three quarter pounds. Still long, creepy, spongy … pick the bad discriptor you like.
The Timney MP5 2-Stage Trigger
It’s nicely machined and ready to go. You just need to move the ejector, ejector axle and ejector spring from your old trigger to this one. It’s easy to do.
These triggers are compatible with SEF/ Semi-Auto trigger packs and their style of safety selector levers.
These triggers are NOT compatible with Ambi/Navy/FBI trigger packs or .22 clones, as they are different internally.
Timney provides clear installation instructions in the package plus they have the following video to help with the install.
Folks, that trigger is amazing. Here are pull test results: Minimum pull weight was 3 pounds 2.7 oz. Maximum was 4 pounds 0.1 ounce. The average was 3 pounds 10.3 oz.
I’d call it crisp and clean. Night and day better than the original Zenith trigger.
Range Time
My brother-in-law, nephew and I took the Zenith ZF5-P and a Century MKE AP5-P to the range. For an MP5, the MKE’s trigger is fairly decent but was seriously beaten by the Timney.
My nephew really liked the Timney trigger – we all did. By the way, one thing I really like is that a B&T low profile optics mount enables you to cowitness a Vortex Crossfire red dot with the iron sights.
Summary
I have never hid my dislike of MP5 triggers – I genuinely don’t like them and the only good things I can say are that they are reliable and you’ll probably never have an accidental discharge.
The Timney trigger ranks as one of the best upgrades I have done to a firearm. If you want a better trigger for your MP5/MP5K, or a clone of them, then get the Timney trigger.
Note, I have to buy all of my parts – nothing here was paid for by sponsors, etc. I do make a small amount if you click on an ad and buy something but that is it. You’re getting my real opinion on stuff.
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at in**@ro*********.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.
I’ve heard about using ultrasonic cleaners on firearms for years but never really investigated them. Recently, I had a need to clean a bunch of HK33 grips that had cosmoline, oil, and whatever else on them. Actually, I knew well in advance because they were part of a project and I had to figure out how to clean up a 50+ of these used grimy grips.
The HK 33 grips had cosmoline on them.
My Cleaning Options
I knew cleaning that many by hand with a solvent would take forever and be expensive. Hot water and dish soap was an option but slow and time consuming. An ultrasonic cleaner seemed like a perfect solution. I talked it over with my friend Scott, who owns Michigan Gun Exchange. Scott has one in his shop and uses it to clean firearms. He showed me how it worked and I was impressed. This type of cleaning would be perfect.
Ultrasonic Cleaners
An ultrasonic cleaner cleans parts three ways – the liquid bath, ultrasonic vibrations and heat all combined at once. If you’ve every fought getting cosmoline or old grease that has set up, you know how heat is your friend.
Okay, it was time to research. I couldn’t afford or have the space for a giant unit. Doing some digging, the Vevor 30 liter unit got good reviews and looked like it would work for the majority of firearm parts I would need to put in it. I considered the length, width, height and the diagonal for really long parts. The stainless basket you put the parts in measures 18.3″ x 10.8″ x 6.7″. The diagonal is 21.25″.
Note, in terms of actual volume it holds, they say the unit is 30 liters in the title but also report that it measures between 29 and 30 liters or 7.7-7.9 gallons. They recommend the fluid be at least 75% full to protect the heating element plus you never run an ultrasonic cleaner dry or it can damage the unit.
By the way, on a larger unit like this, make sure it has a drain valve and the Vevor 30L does.
This is the Vevor 30L cleaner. The unit is simple to operate with the temperature on the left and the timer on the right,
Deciding On The Solvent To Use
Dedicated ultrasonic cleaner fluids are rediculously expensive. What a lot of gun guys do is to use 50:50 Simple Green and water. I started reading more on that and there was one small detail I wanted to avoid – aluminum left in plain Simple Green for too long is apt to react and cause pitting. The aluminum friendly formulation is Simple Green Pro HD.
I’d recommend using Simpe Green Pro HD because it is aluminum friendly. I know guys using the regular Simple Green at a 50:50 ratio and they aren’t having problems – my suspicion is that the parts in the liquid long enough for a problem to happen.
Simple Green’s recommended ratios for their Pro HD formulation are:
For heavy cleaning: 1 part Pro HD to 3 parts water
For medium cleaning: 1 part Pro HD to 5 parts water
For light cleaning: 1 part Pro HD to 10 parts water
Well, given how thick cosmoline, grease and oil can be, I went with the heavy cleaning 1:3 ratio and it worked great.
Two comments – first, I bought mine from Home Depot. They ship to a home for free in my area. Amazon is rediculously expensive due to the weight. Second, I didn’t find out until later that Simple Green also has an “Extreme Aircraft and Precision Cleaner” formula. I might try that in the future as they expressly made it to not react with plastics, composites, aluminum, etc.
Heating the Tank
One complaint of folks using the large ultrasonic cleaners is that their internal heaters take hours to heat the fluid up. Well, I can’t wait hours so did some digging on that front and bought an immersion heater. They all have a potential shock hazard so you do not want to put your hand in the fluid while heating it.
I bought an immersion heater made by HAIYEATBNB off Amazon. because it has a temperature regulator and got good reviews — it’s a game changer. Scott bought one after I told him how fast it heated the tank.
To be clear, the immersion heater is to dramatically speed up the heating of the solvent and then it is removed. A quick summary of steps is to put the heater in the fluid, plug in the unit and set the temperature, let it heat it up, unplug the heater, let it cool off a tad before you remove it and set it in a container so it doesn’t drip. The Vevor cleaner’s internal heating unit can maintain the temperature. The immersion heater is just fast forwarding the heating process.
The recommended temperature range for ultrasonic cleaners range from 130-180 degrees Farenheit. The theortetical “best” temperature for cavitation is 158F (70C) and guys report great luck between 155 and 165. Just bear in mind that the hotter you go, the more evaporation you will have also.
This is the HAIYEATBNB immersion heater. I like having the temperature control and the actual heating element contained inside the metal shield that has the stars on it. Yeah, I am sure the shape will cause some jokes but it works quite nicely.
The immersion heater sped things up dramatically. I could bring the tank up to temperature in 30-40 minutes. The exact time depends on the volume of liquid and what the starting temperature of the fluid is.
The immersion heater’s temperature gauge will not match the ultrasonic cleaner’s temperature gauge. If you want to know the actual temperature more accurately, you use a more precise instrument such as my Fluke 62 Max+ shown here. Note, the temperatures will vary depending on where you point it. At some point you just have to say “close enough” and call it even.
Safety comment: There is the potential for electric shock with any immersion heater. We used them on our farm growing up and survived. I’m not too sure I would worry about any freaked out electric shock comments you see in all of the reviews on Amazon across most of the heaters I looked at. Simply put, avoid sticking your hand in there while it is heating. Standing barefoot in a puddle of water that has an earth ground while putting your hand in the solvent during operation of the immersion heater will get you shocked so don’t do that!! Sheesh.
Testing
I timed the ordering with everything arriving so I could immediately put the unit into use. If it was going to fail, I wanted to know as soon as possible so I could return it.
In terms of fluid, Vevor recommends you have at least three quarters full or you may damage the unit. If the fluid capacity is about 7.7 gallons then this puts it at 5.8 gallons of fluid. (The above photos do not reflect this just to be clear – I had about three to four gallons in when I snapped them.)
I then put in the immersion heater and watched the temperatures climb both on the heater and cleaner’s gauges and they didn’t match. That really wasn’t surprising to me. It’s hard to say which is more accurate but I decided to go with the temperature measurement from the Vevor cleaner. They claim their temperature reading is within +/- 5 degrees celsius which would be about +/- 9 degress Farenheit if I am doing my math right.
Given the size of the unit I could easily put two grip modules in side by side and that’s what I did. I didn’t try stacking them as that might reduce the cleaning effectiveness. I put the unit’s timer at five minutes and let it run. It was fascinating to watch the crud come off – even the red and white paint filler in the S-U-O symbols on the grip were dissolving.
The cleaner was fascinating to watch operate. I took this photo because you caan see the paint dissolving from the selector position marks.
I read a few complaints about the noise these things generate. The Vevor makes a buzzing sound for sure. Maybe it’s just me but it really didn’t bother me. I didn’t need it to be quiet – I needed it to clean stuff.
The timer went off, I then removed the units, sprayed them down with water to remove the cleaner and then used an air line to blow all of the water out.
The results were amazing. Scott had warned me that everything comes off – including the “sheen” of the black plastic resulting in a dull charcoal color. I then went on to do about a dozen more. In two or threee cases there was still some caked on cosmoline inside the grips that a second pass got rid of.
The results were very impressive. In just a few cases did I run a grip through a second time.
Have A Plan to Avoid Rusting Afterwards
I should tell you to have a game plan to avoid flash rust forming on steel items you clean. Ultrasonic cleaners will strip all the oil and grease off so that means untreated steel can form rust when exposed to moisture in the air. “Flash rusting” is a term for when bare steel is exposed to moisture in the air and starts to show visible rust within minutes of exposure.
Spraying WD-40 can help displace water – another option is to use compressed air if you have access to all surfaces – first but then you need something to prevent rust such as a light spray oil or whatever your preference is. My point is to think it through to avoid flash rusting after you clean.
Summary
At this point, I am very happy with the Vevor 30L ultrasonic cleaner. If you have ever wanted to get into ultrasonic cleaning for whatever you are working on, the Vevor units are cost effective and you just need to decide on what size works for you. Click here for a listing of Vevor cleaners on Amazon and here for all brands.
I hope this helps you out.
Note, I have to buy all of my parts – nothing here was paid for by sponsors, etc. I do make a small amount if you click on an ad and buy something but that is it. You’re getting my real opinion on stuff.
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at in**@ro*********.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.
I’m old enough to have grown up with iron sights. It wasn’t until I wasn’t until I was a teenager that I bought my first four power scope for my pump up Crosman airgun. In 1990, I bought my first red dot scope – a big Aimpoint thing that went on my .44 Desert Eagle. Today, 34 years later, I have all kinds of optics, lights and lasers. Do you know what most of them have in common? They all take batteries of one type of another. So, here’s a question for you – when was the last time you checked or replaced your device’s batteries?
My dad was in the 6th infantry at the end of WWII and he drilled into me the need to clean and lubricate firearms. Every time we went plinking it was followed by running patches and then lubricating the .22 rifle. Maintaining firearms was second nature but back then there were no electronic do-dads on firearms. Now, years and years later and a few range trips where optics wouldn’t work due to dead batteries, checking batteries and having spares was added to the list.
Here’s what I want to share with you – if you want to count on your electronic gadgets, you need to maintain the batteries too.
Why bother checking?
First off, batteries have a finite capacity and that as we use them, they eventually run out and need to be changed.
Second, batteries have a shelf-life. In other words, they are chemical devices and at some point, the chemicals are depleted, no reaction can occur so no power comes out. The packaging may say the lithium batteries are good for 10 years – well, that is from when they were made and not when they went in your device.
Also, just when did you buy those batteries anyways? Get older and you’ll understand that last part more. If the packaging doesn’t have a date, I write down when I bought it and guess they are about a year old. I have Surefire CR123A batteries that hit 10 years – time flies by.
You might want to write either the date you bought batteries or the expiry date on the box. In this case, Surefire writes the expiration date on each battery – “04-2033”. I wrote the purchase date on the box so I can track orders but you use whatever system works for you.
As an aside, I take comments like “Our optic’s batteries will last 10,000 hours” or some huge number with some skepticism because they are usually estimated from testing and with a number of assumptions. Your real battery life might vary. So, that cool slide mounted optic you just bought with a huge hour claim — I’d recommend you know how to change the battery and keep a spare around just in case.
Improving Device Reliability
Let me share with you a few things to increase device reliability that concerns the batteries:
1. Know how to change the battery in each device. That might sound simple but sometimes somebody else installs a battery for you on a new optic and then you don’t know what type it is or where it goes so find out and practice doing it.
In the case of Vortex Crossfire red dots, the CR2032 battery is under a cap on the rotating brightness knob.
2. If you log work on your device, include batteries. I am honestly not this organized but some guys are.
3. If you have no idea how old or depleted a battery is in a device, change it. Some guys change batteries before they head to the range. I’ve talked to a few law enforcement officers that say they change the batteries in their lights before they go do something and that’s an option if you have time.
Energizer brand batteries will have a “Use by” date. If you look at the bottom of this CR2032 package, you will see the date is 3/2033. Lithium batteries have a 10 year shelf-life so these were probably made in 3/2023. By the way, a common scam on eBay and Amazon is to sell batteries nearing the end of their shelf-life at steep discounts so be careful who you buy from.
4. Test your device before you go to the range or at least every six months. Shorter if your device is mission critical. Now, just because it powers on doesn’t mean it will last – the battery might be near the end of its life but at least you have an idea. If you want to go the extra mile and have a multimeter, find out what the acceptable voltage range is for that type of battery and discard it when it nears the bottom.
5. Always keep spares – both in your house as well as your range bag. I can’t tell you how many shooting sessions were saved because I had a spare battery in my bag. On the flip side, I’ve had a few range sessions where the firearm had to go back in its case because an optic was dead.
Two days ago, while I am writing this post, I took my brother-in-law and nephew shooting the other day and the CR123A battery in my Vortex UH-1 holographic optic was dead. We were only able to shoot my 10mm Stribog because I had spare Surefire CR123A batteries in the Stribog’s carry case.
6. Buy quality batteries from a reputable seller. Did you know a lot of devices that use CR123A will not be covered if you use a no-name brand battery? Yeah – they had problems with cheap CR123As catching on fire and people wanting warranty coverage so the big device vendors expressly mention that cheap batteries will invalidate their warranties.
Also, not all batteries are created equal – some supposed alkaline or lithium batteries hold a fraction of a charge compared to name brands such as Duracell, Energizer, Panasonic and Surefire. Not to mention that cheap batteries may “pop” open and leak corrosive acids in your battery compartment. In short, don’t go cheap on the batteries for something you need to rely on.
7. Have a plan if the device stops working. This is critical – your red dot, laser or whatever stops working then what will you do? For example, practice shooting a pistol both with the device on and off. Do you have back up sights? Do you need to remove the optic to use the sights? What will you do?
Build For Reliability
Now, I need to expand a bit on that last one when it comes to optics. At this point in life, whenever possible, I want one of two things to be possible – my first choice is to co-witness the optic with the iron sights so even if the device stops working, I can immediately continue with the iron sights with no lost time.
You can co-witness a Vortex Crossfire red dot on a MP5K when you use a low profile B&T mount. It’s a pleasure to shoot and reliable. If the red dot should fail for any reason, I can just use the iron sights.
If that is not possible then I want the optic on a quick release mount that I can get off the weapon in a hurry. You’ll notice most of firearms have American Defense quick release mounts because they are quality and I can count on them. You can use whatever name brand you like but I would not recommend cheap no-name mounts because stuff bends, they don’t return to zero when remounted, etc.
On this one, an MKE rail was used. The rail allows you to use the sights but the optic will not co-witness with them. So, if I need to get the optic off in a hurry, it’s on a low-profile ADM quick release mount.
Practice For Resiliency
Resliency is the property of a material to bend and turn to its original shape. In your case, if an optic fails, how do you stay in the game?You can do all kinds of the stuff above and then life throws you a curve ball – what do you do?
Part of the answer is to mentally rehearse what you will do and then a very important point is to actually practice with the device turned off. How will you aim? How will your transition to a backup light or whatever? How do you get the optic out of the way in a hurry if necessary so you can use the backup sights that are blocked by the mount? It’s one thing to think about these things and another to do them. For example, the quick release levers for American Defense mounts have a small button that must be pressed for the levers to turn. You wouldn’t want to be fumbling around with them if you are in a rush – they move out of the way very easily with practice.
Rechargeable Batteries Introduce New Variables
“No more changing batteries” sounds great but there are still things you need to consider. If you have a device with a rechargeable battery, like a thermal or night vision optic, then remember three it takes time to charge them. To me, this is their biggest Achille’s heel – you can’t swap the batteries and go so plan accordingly. You need to also consider how long will it store a charge and how long will it run? Can you plug in a USB battery pack to extend the life or recharge it?
Even rechargeable batteries have a limited life – it may be three, five or seven years or they may tell you the number of times it can be charged and discharged but you need to have an idea.
Buying Batteries
Amazon is just about the cheapest place I have found to buy batteries. Look for name brands — I only recommend Duracell, Energizer, Panasonic and Surefire. There are dozens if not hundreds of brands out there and not all are good. Whether brand name or no-name, be sure to read reviews before you buy something from a seller other than Amazon directly:
Quick trivia for you – the “C” in CR means it is a lithium battery. The “R” means it is a round shape.
Summary
Electronics are everywhere these days and sometimes we don’t think twice about them. If you want to rely on your firearm and it has an electornic device on it, like a dot optic or light, always factor your devices’ batteries into your maintenance plans. That’s the first part and preventive maintenance certainly helps but you also need to plan and practice in advance if the optic or whatever device fails.
I hope this helps you out.
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