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Stemple Takedown Gun (STG) Stemple-Suomi


Product Description


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.  

Caliber: 9mm

Capacity: Suomi 70-rd & 36-rd mags; Swedish M37/M45 25-rd and 50-rd “coffin” mags

Sights: Finnish KP31 & Picatinny compatible

Cycle Rate: 750-950 (full-auto-only)

Barrel Length: 12.75” with KP31 shroud


Parts and Accessories Included With Each Gun: 1 x 36rd magazine, 2 x 70rd drums, bipod, multi-tool, sling, spare buffer, wooden transit chest (pictured below) and 2 spare picatinny accessory rails for the shroud mount bipod and top optic mount.


2 Patterns Available:
1) Finnish Standard M31 Slant-Cut Shroud with removable bipod rail (13 in. barrel)
2) Finnish Compensated M31 Shroud 
with removable bipod rail (13 in. barrel)


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.

Easy-to-Replace Parts:
There's nothing on these guns that cant 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.

Available Service:
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.

Capacity and Control:  These guns use 70 round drums and are smooth cycling, heavy, accurate, and comfortable to hold.  It's basically an assault rifle with a sub-caliber setup... a very controllable and accurate gun in full auto.  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.  The 'laser beam' performance of this gun makes is one of the most enjoyable full auto guns you'll ever shoot.

Can't Get Too Hot:  These are ideal for machine-gun shoots. The low-pressure 9mm round 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.



Product Videos

Submachine Gun - Suomi 31 - Nick (00:30)
Nick shooting Suomi 31 at Knob Creek gunrange, Kentucky 1209
  • Submachine Gun...
    Nick shooting Suomi 31 at Knob Creek gunrange, Kentucky 1209
  • Submachine gun...
    Keith shooting Suomi 31 at Knob Creek gunrange, Kentucky 12-09
  • Stemple Suomi
    Finnish KP31-Based Setups Just about all of the parts we make...
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