2022 Update: For 2022 we are introducing the new Internally Threaded Pattern (ITP) assemblies of the Stemple 76/45 receivers to offer a more streamlined and versatile system with enhanced compatibility among setups. Per this previously approved method of attaching the trunion, separate trunions and bolt guides are no longer necessary for converting between the standard and heavy bolt systems. While these can still be used on the receiver, one trunion now does it all. For example, the previous U9 conversion to the U9 slow fire setup required separate trunions/bolt guides, bolts, stocks, and buffers. In the ITP setup only the stock and buffer assemblies are switched to add mass to the moving parts for lower cycle rates. The bolt and trunion are unchanged. The fire controls, stocks, and mag housings are also unchanged.
The conversion from the U9SF to the U45 in the combination guns is also further simplified by having a much heavier 45 bolt so a second bolt extension is no longer necessary to reduce the cycle rate.
The STG1928 parts are also fully compatible with this setup.
2023 Update: We've recently switched to NiB Battleworn™ plating (dark gray color) on the lower assembly, magazine housing, and barrel jacket. This high performance finish adds greater durability and ease of cleaning compared to the black anodized finish.
This package is a subgunner's dream. All in one box you've got a complete package to shoot 45ACP with Grease Gun mags or 9mm with Suomi drums and one suppressor to work with both calibers. Switching calibers simply requires changing the bolt, barrel, and magazine housing. It features a simple, smooth-running blow-back system. With the addition of a hydraulic buffer, these are the most smooth, controllable, and versatile subguns on the transferable market. It's so smooth due to the weight, layout, and action; you can actually watch your target being hit through a 4x scope while shooting long bursts. This setup utilizes AR pattern stocks, AR pattern grips, and multiple picatinny mount options for maximum versatility. This gun is also ideal for use with a suppressor. The extra bolt weight drastically slows the initial bolt blow-back thereby significantly reducing port noise common in open-bolt / blow-back SMGs.
The package includes the following parts:
• Stemple (STG) U45 Machine Gun with Low-Recoil Bolt System: Variable weight bolt system with hydraulic buffer that allows shooters to customize performance with a variety of different ammo as well as the 45 to 9mm caliber conversion.
• 2 x M3 Grease Gun Magazines
• U9 Conversion (bolt, barrel, magazine housing)
• 2 x Suomi Drums
• 1 x Suomi Magazine
• Custom Hard Case
• 45 ACP suppressor for use with both 45 ACP and 9mm setups:
(sights not included)
Select-Fire with Quick-Change Barrel
Ultra-smooth adjustable-weight bolt system with hydraulic buffering for slow M3 Grease-Gun-like shooting performance
Magazine: M3 Grease Gun (unmodified) 30 rds
Nickel Boron Plated Bolt and Mag Housing
Weight: 9.3 lbs
Cycle Rate: 500-750 adjustable system with hydraulic buffer, Select Fire (safe-semi-full)
Stainless Steel Barrel
Barrel Length: 10.35" threaded .578-28 or 5/8-24, to use common suppressor
U9 (SF) Conversion Data:
Select-Fire with Quick-Change Barrel
Ultra-smooth adjustable-weight bolt system with hydraulic buffering
Magazine: Suomi KP31 25 rd, 36 rd, 50 rd magazines and 40 rd & 70 rd drums
Nickel Boron Plated Bolt and Mag Housing
Weight: 9.3 lbs
Cycle Rate: 550-800 adjustable
Stainless Steel Barrel
Barrel Length: 10.35" threaded .578-28 to use common suppressor
In 2003, the original inventor, John Stemple collaborated with BRP Corp to make new and replacement parts for the Stemple 76/45 receivers he manufactured prior to the 1986 cutoff. From this came a series of compatible drop-on parts for the unmodified/transferable Stemple 76/45 receivers known as Stemple Takedown Gun (STG) setups. Since nothing is welded or hand fitted to these receivers, changing setups and replacing parts is fast and easy. These are the most finely built and smooth running sub-machine guns on the transferable market. We build them for performance and durability, stock plenty of high-quality spare parts, and provide excellent service. There is only a limited number of these pre-1986 registered/transferable machine guns remaining, so get one while they last.
They are ‘new’
Well, the receivers are nearly 30 years old but the Stemple Takedown Gun (STG) setups are complete new parts packages installed on unused pre-1986 transferable Stemple 76/45 machine gun receivers.
Simple / Durable Design
Our guns are very difficult to break and very easy to fix. They are simple blow-back guns and very smooth-running in long full-auto bursts. Some of our customers who own the 9mm guns liken the full-auto performance to a laser beam.
By using Picatinny rails (MIL-STD-1913) for sights and hand guards, shooters can add a variety of accessories and optics. The configurations with the Adjustable Bolt System use common AR pattern stocks and grips with hundreds of options currently available.
There’s nothing on these guns that can’t be easily replaced. We designed this system to protect the registered receiver from any wear during use. The only parts that can wear can be easily replaced without the need to ship the gun back and forth.
If you need service, we are here to support our products.
Shoot Cheap Ammo
We typically just shoot steel-cased ammo. Our milled steel trunions easily deal with potential wear issues from any type of ammo.
Can't Get Too Hot
These are ideal for machine-gun shoots. The low-pressure pistol ammo cannot create enough heat in the barrel to cause a malfunction or damage the gun. There's no gas system to clog, and the open-bolt system negates any cook-off risk.
Options and Add-Ons:
- Switch to Law Tactical Folding Stock Setup: + $190
- Add Spade Grip Kit: $420
- Add M31 Slant Shroud with Bottom Rail and 9mm 12.875” Barrel: $260
- Add M31 Compensated Shroud with Bottom Rail and 9mm 12.875” Barrel: $260
- Add 12.875" Heavy Barrel (not threaded): $120
- Add 16” 9mm Barrel Threaded 1/2-28: $120
- Suppressor Option: Direct Thread Atlantic Coast Machine MIMS-K 45 high-volume suppressor or Griffin Resistance 45 with 3-lug setup
Spade Grip Setups Also Available: https://www.brpguns.com/stemple-stg-spade-grip-kit/
Videos Hide Videos Show Videos
Stemple Shoot 2015
Stemple Memorial Shoot July 2015 featuring some of the old and...
Stemple U9 Slow Fire 5 14 2015
Machine gunner in this video is competitive shooter Emily Nich...
First Time Out: Stemple 76/45 - STG 9mm Setup
A customer set us these videos of his first time shooting his ...
Stemple 2017 Shoot
July 2017 Stemple Shoot
Long Range Shooting with a 9mm Machine Gun
The Stemple / BRP STG U9 SMG accuracy at 200 yards in full aut...
Stemple Transferable Machine Gun U9-45 Caliber Conversion
U45/U9 Package This package is a subgunner's dream. All in on...
Stemple 76/45 U9 Tripod Setup
Stemple 76/45 U9 Slow Fire Setup with a 4xACOG on a BOG tripod...
STG Universal 2022
19 Reviews Hide Reviews Show Reviews
I got my takedown for a year ago, and have no regrets. The 9mm is very controllable, and runs with all ammo i have tried.
I don’t really know where to start the review for this because they did such an outstanding job with this firearm and package. Out of all the pistol caliber machine guns and subguns that I’ve had the pleasure of shooting this would be the winner if I could only own one of them. Brian and his team have done a perfect job of balancing accuracy, reliability , controllable , rate of fire (with a bonus to it being adjustable), caliber conversion options (they’re working on a 22lr conversion per Brian at the time of this review), durability, quality, and affordability for what you actually get in this package. The fact that they created a way to keep the registered tube intact, protected and assembled without there being anything welded to the tube is genius. Cleaning is a breeze and replacing any damaged or worn parts couldn’t be any easier due to its robust and almost almost tool free takedown design. This may not have a classic design or look to it like similar priced machine guns such as the Uzi but you get all the benefits of modern design and engineering for a great price compared to others in its range. Add in the fact that this package comes with 9mm and 45 cap conversion, a very nice foam cut carry case, a quality suppressor and possibly the best customer service / owner that I’ve ever experienced and it’s a clear choice for me at least. So all in all if you are in the market for an extremely accurate, reliable, and robust transferable machine gun that you would also like to be able to shoot without worrying then this package/ firearm is definitely worth considering.
I purchased this sub-gun based on conversations with Brian and the videos, I am not disappointed. This thing is a well engineered (I am a retired engineer) and an incredibly controllable, accurate weapon. Plus, it is just plain fun to shoot! Moving between calibers is simple and part of the wonderful engineering. Parts are easy to order, I got some extra shims to make barrel swaps quicker. The statement in the product description about being a sub-gunner's dream is spot on. Don't shoot those collectibles! I stopped by this past fall to say hi to Brian and got a tour of his operation. Worth doing if you are in Georgia.
We took my STG U9-45 kit out to the Tonto NF last week north and east of Phoenix, AZ. *** In 9mm.as y'all set it up. When we got my Aimpoint dialed in, I was hitting an 8" diameter reactive steel target 6 of 7 shots at about 40 yards in semi auto with this carbine, offhand. I am not a great offhand shooter with all of my back issues (eight pieces of forged titanium around my spine?) Nonetheless? I was rocking and rolling with your carbine. Your subgun in semi auto with these rounds knocked off nearly all the paint on the steel target! We put about 250 rounds downrange, semi and full auto. Gotta love that? My friend and I were able to keep a full auto mag dump (about 25 rounds at a time) on a ~2' wide by 3' tall cardboard box at around 35 yards... Is that not approximately a "minute of torso?" Neither of us had ANY AT ALL "full auto" experience to lean back on? I certainly would not want to be on the receiving end of this weapon you sold me, even with our novice experience? The weapon is certainly controllable, even with that 1.3# bolt slamming back and forth, for novices? This is an awesome weapon. Kudos to you, sir. This weapon rocks and rocks. You may quote me on this entire message if you like. You may refer prospective customers to me if you wish, by phone or email. No worries, and you don't need to inform me ahead of time:
Hats off to your design, it's simply amazing how well it's put together and runs. I put a 1000 rounds through it and I couldn't be happier with how well it functioned. It's about as much of a "pipe" gun as a hot dog is a sandwich. I can't get over how smooth it ran and I dare say it was accurate on top of everything. And caliber changes took maybe 2 minutes? If it wasn't for being toasty I could have done it a minute but I value my skin... Seriously, you made a fantastic gun.
A superb subgun. Enjoy shooting in either caliber My wife and I agree that the 71 round drum mags make shooting 9mm a little bit more fun than shooting 45 a pound. But still a smoothe shooter in either platform.
I shot the Stemple today. It was as amazing as in the videos that I first saw it in. This is probably the best shooting 9mm machine gun I have ever shot. better than my MP5 and Uzi . It shoots very similarly to my MP40 which I think is one f the best shooting machine guns ever. Thanks again. JB in Forida
We own two. They run flawlessly with cheap, reliable ammo. They are very controllable for point of aim and burst duration, easy to clean and maintain, and damned near indestructible. If you want a good shootable gun with excellent support and parts availability, flexible format, and easy configuration--and why don't you?--this is it.
I own an M60 E6 and an FN FNC full auto, but I shoot my U9/45 more than both. I had two range days this past weekend and the gun functioned flawlessly. With the 9mm setup I was shooting 3” groups doing full drum mag dumps (71 rounds) - all offhand at 15 yards, which is impressive for me. I’m not the special forces here. It was basically shooting through its own massive hole after the first 15 rounds. The package is well put together and the support from Brian is fast and responsive. I didn’t clean the gun all weekend and put well over 1000 rounds through it with no issues. No jams, no misfeeds - just full auto fun. It eats whatever you throw at it. If I had to own just one full auto gun, this would be it. Parts are readily available from BRP and it’s a ton of fun.