I’m sure there are a lot of shooters like me who buy and install back up iron sites on their weapons just in case the optic fails. Except for pure range toys that will never see use beyond having fun, I do think BUIS are a really good idea – optics fail for any number of reasons with batteries being dead quite possibly being the #1 issue – especially given how folks love their red dot, green dot and holographic sights. You need a backup for aiming your firearm.
A quick comment about “BUIS” – it stands for Back Up Iron Sights. I’m a creature of habit and that’s how they were first introduced to me but not everyone uses that term. For example, Magpul calls their units MBUS – Magpul Back-Up Sights. Other’s just say “back up sights” or even just “attachable” or “folding” sights. So, if you are wanting to search and see what your options are, it will take some searching.
Four Camps of BUIS Users
In talking with shooters, regardless of their firearm platform (AR, AK, Stribog, HK, etc.) about their BUIS, I usually find they fit in one of four camps:
Installed the BUIS and run them full time with their optic in a co-witness manner
Installed the BUIS and periodically use them in a co-witness model but fold them down when not in use
Installed the BUIS and only use them when needed but did sight them in. For example, if they need to remove the optic to deploy the sights or are using offset sights and tilt the weapon 45 degrees to use them.
Attached the units to the Picatinny rail, did not sight them in and have never actually practiced using them to hit targets at the range … “but have them just in case”.
With scenario #1, you know those sights will work – it doesn’t matter if the scope is powered off as long as you can see through the glass.
With #2 & #3 – the sights will probably work as long as you can see through the glass or otherwise see them. Hopefully the shooter has practiced enough how to use the units.
The last one is the most concerning – camp #4 – to be honest, a person in this camp doesn’t really have a backup. Yeah, they have the sights but they aren’t dialed in and lack experience with them. This is a gamble you do not want to take. If this describes you – please don’t take it personally and read the next section – I want to help.
If You Are In Camp #4…
First off, I am glad you invested in BUIS – if you are reading this and you haven’t yet, then do so. With that said, do you have quality units or did you buy something dirt cheap off Amazon or eBay. I’d recommend going with a brand name and not cheap airsoft import stuff – I like Magpul (they have a ton of models so click here to see them) plus, in all fairness, there are other quality BUIS sets from the likes of ARMS, Bobro, DiamondHead, Troy and others. Cheap stuff may not hold their zero or break easily. Buy quality to have true BUIS that you can count on.
Second, make sure they are mounted properly. Did you follow the instructions from the vendor who made them? Sometimes there is more to do than slap them on the Picatinny Rail.
Second, you need to sight in the BUIS. I use a laser to help get in the ballpark in the shop and then I do the final tuning at the range. Read up on the recommended range for your firearm and type of optic. For rifles, I go for 50 yards because then you are then zeroed for 50 yards and at 200. The BUIS are just that – emergency backups. I look to be in the ballpark with them and am not looking for perfection but some guys are amazingly proficient with them.
Third, absolutely take them to the range and practice with them!!! Buying, installing and zeroing the BUIS are only part of the game – you must also know how to use them. If they fold, practice on opening and closing them while shooting. If they are offset, practice transitioning to them. Bottom line, you need to practice hitting targets with them and adjust the sights and what you are doing accordingly. The more you practice the greater the odds that things will work when you need them. If you don’t practice then you are taking a huge gamble both on the BUIS and your ability to use them – so don’t gamble.
Summary
The whole reason I wrote this is that it seems like I have encountered a lot of shooters this past year that had BUIS and fell square in camp 4 – they had never sighted them in or practiced with them. This is very concerning to me – they are gambling on something that shouldn’t be left to chance. So, yes, I think BUIS are a great idea but you need to sight them in and regularly practice using them also. If you don’t, then your backup probably isn’t a backup.
I hope this gives you some food for thought.
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.
Hi folks. I like building AR rifles and sometimes I just want a kit with all of the parts. Sometimes I will then swap stuff out and the original parts go in a bin but they are nice to have as spares and sometimes I will build the kit with the included parts – it just depends on my mood and budget to be perfectly honest. For years now, my main source for kits has been Palmetto State Armory (PSA) headquartered in Columbia, SC.
I almost always get my stuff off their website but they do have some very cool retail stores scattered around South Carolina. I had an opportunity to go to one a couple years back and it was very cool. Unfortunately, I lacked funds at the time and just picked up a couple of items. A person could put a serious dent in their credit card by going in one of their stores … or their website for that matter 🙂
People used to complain that they were slow to ship and to respond. First off, I always knew they were trying to keep costs low – they always shipped and they did respond – just not right away. For over a year now, I have noticed they are far faster at shipping – sometimes even the same day – and they are also faster at responding. So, if you hear bad stuff about this, I wouldn’t worry about it.
I’ve also heard people question their quality. Folks, if you want a tier one rifle, go buy a tier one rifle or the parts from them. Palmetto gives you a decent combination of quality and price. For folks planning on hunting and target shooting with their friends, I have no reservation to recommend them. If you are shooting in competition or planning to use this rifle in some kind if law enforcement situation or somewhere that requires high reliability, I think you probably need to look at the higher end ARs that are designed to handle tens of thousands of rounds. Look, I’m just being candid – the PSA AR rifles and pistols are solid but they have a different intended audience. There are reasons besides “coolness” where certain buyers must move to suppliers like Daniel Defense, BCM, Knights, LMT, H&K, LWRC, etc.
At any rate, back in April of this year (2021), I asked what their top four complete kits were (meaning everything except the lower receiver) and they had a list! If you like building AR kits like I do, I thought you might find this interesting in terms of what is included:
Noteworthy here is the entry level Magpul MOE buttstock and grip plus Magpul MBUS flip up sights. They are also including a PSA EPT fire control group – this means that the trigger and hammer have nickel boron finish causing them to move easier because friction is reduced.
It has one of the PSA 13.5″ long handguards set for M-Lok attachments. Everything else is typically found in any of their AR kits with a collapsible stock. They make and restock these kits all the time.
Despite a cool looking 15″ handguard, this is a basic AR and you can replace the grip and buttstock later if you want. It’s selling so well that PSA is out of stock right now but you can be notified when it is back in stock. They tend to make and restock these kits all the time.
The price isn’t listed right now since they are out of stock but I would expect it to be slightly less than the first kit – unless they are charging a premium for that handguard.
Definitely a basic 15″ railed rifle kit. Everything looks entry level but you can always customize it down the road if you want.
Again, no price as they are out of stock. I’d expect it to be cheaper than the two kits above. You can sign up to be notified when they do get it in stock if you want. They tend to make and restock these kits all the time.
This one has the Magpul BUS sights, an interesting looking handguard … and that’s about it. Everything else is what you tend to see in any of their basic AR rifle kits with collapsing stocks.
The price as of today s $649.99
What rifle is in the top photo?
It started out as a PSA 16″ kit. It had an Anderson lower, WMD bolt, and a Magpul ACS-L stock – I like those because they lock in place and don’t rattle. It had a BMC Mod 3 charging handle, Vortex 1-6x scope on a Vortex 2″ offset mount, YHM extended push pins and a PSA ambidextrous selector lever. The fire control group is one of the PSA EPT sets – I do like them for basic triggers. I like Geissele SSA-E triggers the most though. I honestly don’t recall who made the offset sights.
Conclusion
If you’re looking to build a decent entry-level rifle from a kit with all of the parts you need other than the lower receiver, the above should work great for you. At a minimum, they will all give you a foundation to start with.
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.
You may be thinking I am kind of late to the game with a post about the 3D printing of firearms but you’d be a bit wrong yourself. This domain is alive and exploding with designs that range from almost entirely 3D printed to sophisticated hybrid designs where some parts are printed and some key parts are leveraged from off the shelf suppliers such as Glock slide assemblies and AR uppers.
Just look at these examples:
There are just tons and tons of designs – AR receivers, AK receivers, vz Scorpion receivers, modern polymer pistol lowers … the list goes on and on.
It’s interesting to look at this vibrant community as a one step removed observer. I am intrigued by the innovation and the designs but I also have zero time to learn 3D printing at this point. Between my day job, Ronin’s Grips, family and the need to sleep at least a few hours every night, there is no free time. My wife also made it clear to me in no uncertain terms that I am not to buy a 3D printer — which really doesn’t phase me because I have no time as I mentioned.
The reason I wanted to take a moment and write this post is so that those of you who are curious can dig into the many how-to guides and access the tons of designs that are accessible at this time. It’s hard to say what way the winds of regulation will blow in the United States or a given state for that matter. In some countries, even the possession of these 3D design files would get you in huge trouble.
With that said, the following links are provided for educational purposes only. Please understand the laws and regulations in your area before you download anything or try to build a weapon. You assume all liability.
In addition to CTRL+Pew mentioned above, there are tons of download links where people are sharing/replicating a huge “Print2a” repository plus have photos and links to individual designs:
Honestly folks, I am not kidding. I find this topic fascinating from an engineering perspective but I have no plans to get into it. Consider this blog post as an introduction and you will need to take it from here.
For all the authors cranking out these amazing designs – rock on! I seriously enjoy seeing them.
Lastly, why did I mention Pandora’s Box in the title? Because I highly doubt the proponents of gun control will ever be able to close the box again.
Again, the above links and information is provided for educational purposes only. Please understand the laws and regulations in your area before you download anything or try to build anything. You assume all liability.
All renderings and the photos of the Mac Daddy are from files that claim to be in the public domain. I do not own them.
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.
In the last post, I covered installing the forward assist button and the ejection port cover. In this post, we’ll proceed with installing the Midwest Industries 7″ Combat Rail, gas tube and the Satern helical muzzle brake.
Special Assembly Note
Here’s some hard won advice I want to share with you. When you install the barrel nut and the muzzle brake, there is significant torque involved. You absolutely do not install a magazine well block in a vise or clamp the upper directly — You will bend or break stuff. For example, the alignment pin on the barrel will let go – and has done so to tons of people who didn’t secure their upper properly … Spend the money to get the right tool.
Here’s my personal experience: Years ago before I knew much about ARs, I had one of those little jigs that puts pins through the takedown and pivot pin lugs – I think I got it cheap off Amazon. At any rate, I was trying to remove a bird cage muzzle brake that was on real tight and managed to bend the takedown lug of the upper and that was the end of me using those. Yeah, I was ticked and then I started asking around what tools/jigs folks were using.
There are two options for you that I can recommend. Personally, I use a Magpul Barrrel Extension Vise (“BEV”) Block with a bolt carrier to secure it. It has steel lugs that engage the barrel extension and a full-length steel shank for strength. I’ve used many times over the years and it hasn’t let me down.
Your other option is a Geissele Reaction Rod. I’ve heard good things about the Geissele rod but have never used it. Guys who have it gush about it and you know how fast guys are to complain when a tool sucks.
You can usually find either at Brownells, Midway, Primary Arms, PSA, etc. There’s a lot of back ordering going on these days so you might need to hunt some.
Midwest Industries 7″ Combat Rail
Let’s roll right into the handguard discussion because we will need the barrel nut to install the barrel first. With the advent of the free floating handguards, meaning the handguard does not touch or push on the barrel affecting accuracy, makers started creating their own barrel nuts that their handguard would attach to and the nuts vary dramatically in terms of design.
My favorite AR free floating handguards are the Midwest Industries (MI) Combat rails. They are very well made, rugged, easy to install and all the surfaces that can poke or nick you have been rounded over. I’ve installed four of them now and really do like them.
For the 7.5″ barrel, I opted for a 7″ rail to allow for the muzzle brake to poke out the end and vent properly. I also only use M-LOK attachments now and the Combat rail has those.
The MI Combat rails come with installation instructions that are quite detailed. Take the time to read them before starting. If you have questions you can either contact them or do some quick searching. In general, a little bit of time spent preparing can make things go far more smoothly.
To install the rail, the first thing to do is to disassemble the rail – Midwest Industries ships the unit with the barrel nut, torque plate and two screws installed so you can see how it goes together plus it keeps everything tidy.
Pistol Length Gas Tube
Once the barrel nut has been installed, the gas tube is easy. I bought a 0.875″ diameter gas block and pistol length gas tube from Satern. They make a single divot on the bottom of the barrel so when you slide the tube into place and tighten the set screws, the gas block is properly located. The installation is easy – slide the block on with the tube going into the hole made for it at the top of the receiver.
Satern “Heliport” Muzzle Brake
Because this is a low profile brake, you can install it before or after the handguard. If you are installing a tanker brake, you’d do it after the handguard. In my case, I opted for before.
Remember what I said earlier. You need a jig to properly hold the barrel or something will brake. In this case, you run the risk of the index/alignment pin on the barrel shearing off or bending the receiver. Don’t do it.
Installing the Handguard Itself
At this point you should have the barrel installed, the barrel nut installed and torque down as well as the gas tube. Installing the handguard is actually quite simple. You slide it back onto the nut with the “ears” aligning it to the upper’s rail. You then flip the receiver upside down, install the torque plate, apply thread locker to the screws, install and torque them down to 55 in-lbs.
Install The Bolt Head
I bought the bolt head from Satern and it needed to be installed in a carrier. Luckily I had some spares from cases where I swapped out bolts for WMD NiB bolts. I opted for a carrier with a nice smooth nitride finish and installed the head. Note, during assembly I apply a thin coat of Super Lube grease to all sliding parts. I’ve found it’s a great break in lube.
Install The Charging Handle, Bolt Carrier Group & Done
I installed the BCG and BCM Mod 3 charging handle into the upper and with that, the upper was fully assembled not including any sights or optics.
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.
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.
A Beowulf uses a standard AR upper receiver with an enlarged ejection port. My Alexander Arms (AA) upper has an ejection port that measures 3.02″ wide x 0.62″ tall. In case you are wondering, I grabbed on of my PSA 5.56×45 ARs and its port measures 3.02″ wide x 0.49″ tall.
The PSA’s port is about 0.35″ from the bottom of the base of the picatinny rail that has a casting line in receiver to the inside of the port. The AA still has the stepped lip for the ejection port door even though it doesn’t use one so I am measuring to the actual opening. I’m not sure how standard that measure is but offer it up – it does correspond with the top of the case deflector in the three ARs I looked at. The AA’s port is also about 0.35″. Note, this is an approximate. I’m trying to use caliper to measure a curved surface.
So this means you can either buy a standard upper and enlarge the port yourself or you can buy an upper that comes with the port already enlarged. Satern makes a big bore upper that supports the Beowulf round. Rather that bothering machining an existing upper, I went with the Satern receiver.
The Satern’s opening is 3.02″ wide x 0.62″ also. The slight difference is the measure from that casting mark under the rail to the entrance – it’s about 0.38″. Again – that last measure is a ballpark depending on the angle I hold the calipers. I can tell you for sure that it slight further down than the AA’s port.
So, to assemble the base components on a stripped upper is easy. I’ll go cover each of the basic parts to make a complete upper.
Install the Forward Assist
It’s interesting when you read about the history of forward assists on the M16. Eugene Stoner, the original designer of the M16 platform, did not think one a forward assist (FA) was needed and that if one had to force the bolt to close then it would probably cause a problem later when it came time to extract. Colt, however, wanted to make government buyers happy. The US Air Force didn’t think the FA was needed but the Army demanded it have one and later claimed it was for psychological reasons.
I have a mixed opinion on them as do many people. If you must force the bolt closed then something is wrong. I’ve used it relatively little and there was, in all cases, underlying problems *but* it might help you fire that one round that makes a difference. So, I build with them, they are there but I very rarely use them.
With that said, the Satern upper has a provision for a FA and you need to install one. I used a model from CMMG and installation is easy:
Lightly greased it first with Superlub grease and then inserted the assembly in into the hole with the pawl (the little “foot”) rotated towards the bolt.
Press the FA all of the way into the tube and while holding the FA all the way forward, use a roll pin starter punch to drive in the roll pin that will hold it in place.
Note, have some wood or something under the tube that the FA is going into. Supporting it will make driving the roll pin into place much easier. The starter punch gets the pin into the hole and then the standard roll pin punch will help you tap it into place until flush. It does not require a ton of force.
Test the FA – it should spring in and out.
Turn the receiver upside down and press the FA button again, you should see the pawl come out of it’s tube in the side of the receiver – it should be oriented/rotated to push on the “teeth” on the side of the bolt (yeah, that’s what those “ribs” in the side of the bolt are for.
Installing the Ejection Port Cover Assembly
As you read above, the Beowulf has an enlarged ejection port so a standard-sized 5.56 ejection port cover/door will not work. Okay, you have two options at this point. Either skip the cover or buy one. I went with the latter because Satern makes an enlarged cover that fits their receiver.
In terms of installation order, installing the cover does need to be done before the barrel locking nut because the nut will block installation later. Here are the steps:
If the clip hasn’t been installed on the pin yet, you need to tap it on square with a small hammer. I’ve had guys tell me they’ve used pliers for this step but I haven’t done that. Note, be careful and pay attention – the little clip can really fly away if it isn’t tapped into place squarely.
Lay the upper receiver down with the ejection port up. I usually place it such that the barrel nut threads are to the right.
Note the spring has a long and a short leg. The long leg will rest on the cover and the sort leg will rest on the receiver.
The basic installation is to move the cover into place, slide the pin in from the left (back of the receiver) towards the right and sliding through the tube in the cover but stop just before the opening where you will put the spring.
Note the spring has a long and a short leg. The long leg will rest on the cover and the sort leg will rest on the receiver.
This is the part that drives me nuts – I pivot the pin away from the receiver just enough to install the spring. The short leg of the screw will go against the receiver and you need to twist the long end to create the tension.
I then try and hold it all in place while sliding the pin the rest of the way in. There are videos out there on this and different people do it different ways. It can be frustrating so just be patient.
Yes, the right end of the pin is just sticking out because once you install the barrel nut, it’s not going anywhere.
You should be able to put a finger in from the bottom of the receiver well and pop it open. I do this as a quick test.
To actually function test the cover, temporarily install the charging handle and bolt. Close the cover with the bolt closed as well. When you pull the charging handle back, the cover should spring open. If it does not, then you have most likely installed the spring wrong.
Last step is to use some clippers and trim the small portion of the small leg of the spring that is sticking into the ejection port to get it out the way. Don’t do this until after you have the cover installed and tested.
The Barrel
In my opinion, you’ve just finished the hardest parts of the upper. I hate that little demonic dust cover spring just to be clear 🙂 The next three are pretty much tackled together because aftermarket handguards come with their own barrel but that needs to be installed.
First off, I went with Satern because the barrel in my first 12.7×42 rifle was made by them and was very accurate. Second, I liked that they sold it with a matching headspaced bolt. My biggest problem with my first rifle was that Radical Firearms did not include the right bolt. [Click here for my post about that first build if you are interested.] A common misconception is that a 12.7×42/Beowulf cartridge uses a 7.62×39 bolt. This is not correct. The depth and extractor are different. 6.5 Grendel does use the same bolt as 12.7×42. So, when I bought my Satern barrel, I bought it with a matching bolt just to play it safe.
The barrel is threaded 3/4-24. This is not the same as an Alexander Arms barrel. I asked Satern why and they told me they wanted a thicker wall. Whatever the reason, you need to remember this thread size when you are buying whatever brake or muzzle device you plan.
One of the really cool design aspects of the AR system is that the barrel just slides into the receiver and is properly indexed by the pin shown above fitting into a corresponding notch in the upper receiver. The barrel is “locked” into place via a barrel nut. A gas tube then slides into place over the barrel with the gas tube entering the upper receiver above the locking at the top. I’ll come back to that shortly.
In Conclusion
After test fitting, it’s time to get into the installation of the barrel, nut, gas tube, handguards and brake. I’d say that’s enough to cover in the next post!
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.
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.
My friends know I am eccentric so I’ll point that out right up front. I design and build firearms that are very practical and some that are pushing the fringe. I’ve liked the .50 Beowulf cartridge (also known by it’s metric designation as 12.7x42mm). Bill Alexander designed the Beowulf to operate out a fairly standard AR platform which included a 16″ barrel and normal buffer. With the huge popularity of AR pistols with braces, I got to thinking – how short can I go?
Well, there are a number of pistol length uppers now that are 12″. Alexander Arms themselves both a 12″ complete upper as well as a 12″ DIY upper waiting for you to add your handguards of choice. There are cheap builders out there and I would tell you to be very careful to research the vendor before you buy. Some of them have awful track records.
Know what? I wanted to go even shorter and I had no problem buying the parts and building one myself. You see, I wanted a howitzer. To me, a howitzer is a firearm with a barrel so short that it can’t burn all the powder before the bullet exits resulting in a spectacular flare. Useful? Not really. Cool? Oh hell, yes 🙂
Satern’s Liberty Barrels & Upper Parts
If there’s one thing I have learned about the Beowulf, you need the right combination of parts or reliability will suffer. So that really meant that I needed to go with a reputable vendor. There’s a barrel company that really knows their stuff that you may not of heard about – Satern. They are located in Estherville, Iowa, and operated by Debra and Steven Satern. I talked to Deb a few times while I was planning my build. They were great to deal with and shipped fast – even with all the COVID craziness these days.
different barrel lengths – 7.5, 10.5, 14.5 and 16″ – note they come with the correct headspaced bolt. This is a big deal. Not all vendors use the right bolt and that causes reliability problems. Also, the thread is unique – 3/4-24 and not the 49/64-20 that Alexander Arms uses. This means you will need to either get your brake from Satern, Timber Creek or another vendor that supports a .50 cal with 3/4-24 threads. I went with Satern’s Heliport brake in part due to this threading.
They offer Barrel kits with brakes
Big bore forged uppers – basically a standard AR upper with the ejection port milled open larger. They offer uppers with the dust cover already installed or just a stripped upper
Gas tube assemblies
I went down their menu and bought the 7.5″ barrel, 3/4-24 Heliport brake, stripped upper, ejection port door, and pistol length gas tube from them. I just like doing my own thing is what it boils down to.
Other Parts
Once I had the main parts of the upper figured out, the rest was pretty easy. The lower is how-ever you want to build your lower. I planned for a pistol build using some of my favorite parts:
SBTactical’s SBA4 brace – it has six positions and the rear end is stiffer and better formed than the SBA3.
Midwest Industries Combat Rail – these are very well made and finished. I especially like how the handguard fits onto their locking nut allowing for a ton of flexibility.
Vortex Strikefire II Red/Green Dot – these have a real nice wide field of view allowing for rapid target acquisition plus it can co-witness with iron sights out of the box.
BCM’s Gunfighter Mod 3B charging handle – I’ve become very fond if these over the year’s and the enlarged latch handle just feels right to me.
Summary
That’s it for now. The next post will start to get into the actual build.
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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.
The short answer is that they are the same thing. The bullet’s diameter is 0.50″ which is 12.7mm and the case length is 1.65″ or 42mm. The reason you see some vendors say they have something to sell in 12.7x42mm is they are trying to avoid a trademark problem with Alexander Arms.
Bill Alexander, of Alexander Arms, did all the engineering to bring to life both the round and the AR components to use it. He also trademarked the term “.50 Beowulf”. As such, anybody who wants to sell something and refers to it as being for .50 Beowulf would need to get the permission and/or license the use of the term “.50 Beowulf” to avoid legal problems. So, a lot of vendors use the generic metric designation of 12.7×42 to avoid legal hassles.
With that said, bear in mind that not all engineering is equal. I have never had a problem with Alexander Arms parts but myself and others have had plenty of headaches with 12.7×42 components from budget AR vendors who haven’t done the engineering. In nmy case, it was poor extraction with a Radical Arms bolt and extractpr. So, buyer beware and research a vendor and their offering before you buy plus make sure they are reputable in general in case you need support. For example, Satern worked great for me and I wrote a blog post about the build.
Conclusion
So, short post this time. 12.7×42 and .50 Beowulf are the same round with different descriptions but be cautious to check out vendors selling parts using the metric designation. Some of them are selling junk so search for current reviews of products before you buy them.
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Interest in the Beowulf round is growing as people buy the low cost 12.7×42 chambered pistols, rifles and kits. 12.7×42 is the metric designation for the Beowulf and is being used by groups wanting to avoid a trademark problem with Alexander Arms.
I’ve owned two .50 Beowulf’s and my current one was built using an Alexander Arms DIY kit that allows you to add the handguard and brake that you want. They are built on standard AR lowers so if you have an AR today, it’s just a matter of adding an upper in this caliber or you can do a whole new dedicated build – it’s up to you. I’ve also done a number of posts about my builds in case you want to learn more – click here to see a list.
For ammo, there is an increasing variety out there – Alexander Arms makes their own with a variety of loads plus there are other sellers out there with their own offerings. I’ve found the Alexander Arms 350 grain Hornady XTP ammo to be accurate and the XTPs really open up on impact.
That’s it for now. I hope you found this helpful and have fun building and shooting a .50 Beowulf.
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