Category Archives: Firearms Building and Gunsmithing

How to build and/or gunsmith on certain platforms.

ARBuilds

Building a 12.7×42 (.50 Beowulf) 7.5″ Pistol – The Wulferine: Post 1 – Planning The Parts

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.

This is Satern’s stripped big bore upper that will work with 12.7×42 (.50 Beowulf), 450 Bushmaster and .458 SOCOM. The ejection port has been enlarged for the bigger cartridges. Note, they also offer a complete upper with the ejection port cover, forward assist, charging handle and bolt options as well as a complete upper without the bolt.

Satern has pretty much everything you will need to build a 12.7×42 upper. They have:

  • 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.
  • 12/28/2020: I am tinkering with the combination of buffer and buffer spring. Click here for a post about them.
  • 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.

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**@*********ps.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.

AKBuilds

What are rear stock options for SDS Lynx 12 Gauge shotguns?

A fellow messaged me the other day and asked what options he had to replace the light fixed stock on his SDS 12 gauge shotgun. I told him that he has a lot. The rear of an SDS is very similar to an AKM or AK-74.

The rear piece that holds the stock in is called a “trunnion” they are what provide the real strength in the sheet metal receiver. The stock is held in place by the two screws you see. Be sure to use a blade screw driver bit that completely fills the slot. You can see that whomever installed the screws at the factor did not do this and slightly deformed both slots by using an undersized screwdriver or blade bit.
You may need to use a wood dowel, or whatever you have handy, to tap the stock out. I like using a hardwood dowel because it doesn’t bend or scratch things all up.
I used a Rifle Dynamics adapter that lets you convert from the AK-rear to an AR/M4 buffer tube. Both the Rifle Dynamics adapter and the one sold by PSA are very well made.

With the rear stock removed, you can use any AKM/AK-74 traditional wood or polymer stock that you want or adapter to use an AR-style stock. Read up online before you buy because there are tons and tons of options and combinations for you.

I hope this helps you out and here are a few examples for your consideration:

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ARBuilds, Shooting in General, Uncategorized

What is the 12.7x42mm cartridge? Is it the same as .50 Beowulf?

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 my case, it was poor extraction with a Radical Arms bolt and extractor. 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.

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**@*********ps.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.

AK & Related Rifles, AR & Related Rifles and Pistols, Firearms Building and Gunsmithing, Pistols

ATF Letter June 2019: How to Measure The Overall Length Of A Pistol With A Brace

In June 2019, someone as the the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), Firearms Technology Industry Services Branch (FTISB), what was the correct way to measure a pistol equipped with a stabilizing brace that has a folding adapter (like my Galil Ace in the photo above).

They said that the overall length is measured with the brace in the folded position. So you can confirm this for yourself plus see their reasoning, click here to read the scanned PDF copy that has the names redacted for privacy’s sake.

Please note that I am not an attorney and this is not legal advice. I’m just passing along the ATF letter for people to read and interpret themselves.

I hope this helps you out.

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**@*********ps.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.

Glock, Glocks, Polymer80

A review Of my Swenson Glock 17 Slide – It’s Solid

I bought a basic Swenson slide almost two years ago and it’s been solid. Part of what attracted me to it was the beveled nose that allows for easier insertion into a holster. At any rate, I’ve had guys ask me if Swenson slides are any good and my experience has been positive plus from what I have read, most guys find them good. Let me put it this way, if I found a good deal on one to host a RMR optic today, I’d buy it.

The Slide You See

When I first installed it on my first Polymer80 PF940V2 G17, no fitting was needed. However, when I built the PF940CL that it is on now, I did need to use Goodson 400 and then 800 grit lapping compound to get a good fit. Initially there as some binding and now it is just nice and smooth. [Click here if you want to read more tips]

That is the only tuning I’ve need to do. The channel spring liner and all slide parts went in easily and I’ve not had any problems. It’s hosted both it’s current Storm Lake barrel as well as a threaded barrel that I bought from 80P builder with no problem. All in all, it’s worked just fine.

View of the ejection port side. Just a solid basic slide.
Here’s the other side.
Here’s the bottom. Other than the Storm Lake barrel, I think all of the other parts are OEM Glock.
I really like the beveled nose and prefer it for carry pistols. Also, Streamlights are my go to brand for light and laser combos. The TLR-4 works great here and any of the TLR series would since this is a full size pistol. The CL just has the shorter G19 grip to aid with concealment.

So, if you are hunting for a slide for your Glock or Polymer80 build, take a look at Swenson models. They have quite a few designs to select from now including fancy windows and various optics cuts. Just remember, if you are doing a Polymer80 build, look at slides meant for Glock Gen3 models.

The problem these days is finding them. The whole market is in pandemic shock – either hit with supply chain problems or unprecedented demand for guns, ammp and parts. With that said, I did some searching and see Swenson slides either at Midway USA or on eBay and the following is a real time search of eBay for themL

I hope this helps you out!

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**@*********ps.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.

Glock, Glocks, Polymer80

Storm lake Glock Barrels Are Good To Go – I sure Like Mine

I recently built a Polymer80 PF940CL – their compact long model. This is an interesting variant because it is a their Glock 19 grip but built to use the longer Glock 17 barrel. I had a threaded barrel I could have used but opted to get one of the Storm Lake model 34000 barrels after doing some digging around on their quality. I’m impressed and figured it made since to share a quick review with you.

Storm Lake barrels are made in Tennessee. While not everyone may know their name, they’ve been around since 1983 and sell barrels for 1911s, Glock, Springfield XLs and S&W M&Ps.

Their barrels are made from 416 stainless steel, are hardened to 40-42 HRC and rifling is 1:16LH. The rifling is broach cut to support both jacketed and lead bullets.

My Glock 17 Barrel

The 34000 is a 9mm 4.49″ long barrel with no ports that weights 0.30 pounds. I don’t plan on running a suppressor or a compensator so there was no real reason to have threading especially if I ever carry it.

Here’s my 4.49″ 9mm barrel.
The black stuff is carbon from shooting. It’s an accurate and reliable barrel.
The feed ramp is nicely done. I don’t shoot unjacketed bullets but it worked great with S&B 124gr FMJ , 115 grain FMJ – not sure of the maker – and 124gr Hornady Critical Defense HP rounds.
There is a slight crown to protect the muzzle and rifling.
Here it is in the PF940CL

All in all, I have nothing negative to say. I am not some super duper target shooter. It’s accurate enough for me under 25 yards and I’ve not had any problems. Now part of that is the build and the magazines too but again, no problems!

I have no hesitation recommending Stormlake barrels. Best of all, I think they are very affordable and show that you don’t always have to spend a fortune to get good quality.

The best selection and prices are actually on eBay. The following are items live on eBay for the G17, 19 and 34 plus other models so just scroll down:

Conclusion

I hope this helps you out!

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**@*********ps.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.

AKBuilds

Introducing 1/2″ and 3/4″ Pull Rings For Our Quick Takedown Pins

When I originally designed our Quick Takedown Pins for the Yugo M85/M92 and then also the Bulgy/Tula Krinks, PSA AK-V and Vepr 12 shotgun, I used my hand size as a gauge for making a pull ring big enough. Guys have asked me repeatedly over the years for smaller pins but I could never find them made well enough that I felt good about carrying them — until now!

This is my AK-V with its quick takedown pin with the standard size 1″ ring installed.

This last time when I placed an order with the machine shop that makes my pins, I asked if they could do custom heavy duty 1/2″ and 3/4″ pull rings from stainless steel with a black oxide finish and they said they could! It cost a fair penny because I needed to order a boatload of each but here they are as an accessory if you want to purchase them … please purchase some 🙂

Here are the three rings side by side. The pins all come with the 1″ standard ring installed.

The 1″ and 3/4″ rings are very beefy. We had to go to smaller gauge wire to do the 1/2″ rings but they should work just fine – it’s really the pin itself that does all the work.

Click here to go to the page with all of the pins and rings if you would like to place an order.

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**@*********ps.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.

ARBuilds, USA

Looking for a Cool AR Rifle Project? Build a .50 Beowulf

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.

The Beowulf is one heck of a thumper delivering massive kinetic energy on target from the base AR-15 platform. That’s the remarkable part – it uses a standard AR lower! To give you an idea of the size of the round take a look at this photo. From top to bottom: .50 Beowulf 350gr XTP, 5.56×45 55gr FMJ , 7.62×39 123gr FMJ and a loose 9mm 124gr Hornady HST. The Beowulf sure dwarfs the little 5.56×45 round!

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.

A Beowulf upper can mate to any in-spec AR lower. This is a Spike’s lower with an Ergo group, Magpul PRS III and Geissele trigger.

What caught my eye the other day and prompted me to write this post is that Primary Arms has noticed the growing interest in .50 Beowulf and is now carrying a variety of parts and ammunition. They have a lot of products in stock and they ship fast. I’ve placed a couple of orders with them for parts over the past month and they are still shipping stuff out either the same or next day – that’s remarkable given how busy the industry is right now.

To give you some examples of .50 Beowulf products that Primary Arms has currently, they have the Alexander Arms DIY 16″ barrel kit and also the Timber Creek Heart Breaker muzzle brake, which is my favorite Beowulf brake.

This is the 16″ DIY kit. Alexander Arms has done all the fitting for you. It comes with one magazine as well. In terms of the upper kit, I found the machining and parts fitment to be excellent.
This is the Timber Creek Heart Breaker and it does a remarkable job of reducing the recoil. It has three heart shaped ports on each side that redirect the blast backwards to propel the rifle forward and reduce recoil. The three circular ports on the top help reduce climb. Seriously, this is a solid brake.

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.

The is older packaging. In 2019 I noticed Alexander was using an eye catching color scheme of navy, black and white – same ammo just a different box. The Alexander Arms .50 Beowulfl 350gr XTP ammo is packed 20 rounds to a box and Primary Arms has it in stock.
Here’s the whole Beowulf.

So, if you want a fun build, get the kit, the handguard you want, the brake you want and take it from there. For folks who like optics, I’d recommend something that can help with fast moving up close targets as well as out to about 200 yards — I paired mine up with a Vortex 1-6×24 Strike Eagle and the 1-8×24 model would be great also.

This is my 1-6×24 Vortex Strike Eagle using a Vortex cantilever mount on my current Beowulf rifle.

One last comment, I make my own magazines using the reliable but inexpensive aluminum D&H magazines that PSA sells. They typically go for $9.99 on sale to $12.99 normally and right now they are on sale in case you want to snag some – they also have their special going on where you can get one of their 36″ rifle cases plus 7 D&H magazines for $109.99

This is one of the 30 round D&H 5.56 magazines that you can use to hold up to 10 Beowulf rounds.
This is the very well made 36″ PSA rifle case deal that includes 7 D&H mags.

Conclusion

That’s it for now. I hope you found this helpful and have fun building and shooting a .50 Beowulf.

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**@*********ps.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.