Suomi Project Gun Parts

Stemple Trunion Assembly - Slide Lock Pattern

Standard replacement Trunion Assembly for Stemple STG Standard Bolt Setups without pin mounts: Includes trunion, ejector, locking piece, locking pin, and spacer. Compatible with U9, 76, Stemple Suomi & 34k Stemple 76/45 setups without trunion mount...

9MM Barrel Blank 21"x 1"

9MM Barrel Blank 21"x 1" Made by Small Arms Manufacturing Co around 2005. 1:10 Twist 4140 Chrome Moly HAS SOME RUST    

KP31 Suomi SEMI AUTO HEADSPACE pattern 9mm Barrel 16" Threaded 1/2-28

16" barrel for Semi Auto KP31.   Works with slant pattern KP31 shroud.  Will work with compensated shroud if the exit hole is opened to .635".   HEADSPACE on Closed Bolt Semi Auto Guns vs Open Bolt / Fixed Firing Pin Blow Back...

KP31 Shroud Shim - .002" thick

Copied from original parts and made from stainless steel.   Thickness .002"   This part tightens the barrel jacket to receiver fit by 'shimming' the rear of the barrel shroud to receiver/trunion.   This is a very useful part for...

KP31 Barrel Shim - .001 thick

Copied from original parts and made from stainless steel.   Thickness .001"    These are the most thin we could make.  They are excellent for fine tuning your barrel to trunion to shroud fit.   This part tightens the barrel...

KP31 Shroud Shim - .005" thick

Copied from original parts and made from stainless steel.   Thickness .005"   This part tightens the barrel jacket to receiver fit by 'shimming' the rear of the barrel shroud to receiver/trunion.   This is a very useful part for...

Stemple STG 9mm Barrel 12.875"

12.875" barrel for BRP Stemple Takedown Guns.  These can be adapted for use with Finnish KP31 and semi auto variants.   Works with slant pattern KP31 shroud.  Will work with compensated shroud if the exit hole is opened to .635"...

Stemple Trunion Retaining Pins

Standard set of replacement Trunion Retaining Pins.  (2 pins included)

Stemple STG U-9mm, 76, 76W, 34k Trunion (Threaded Type)

2006-2010 Threaded Type Trunion.  Standard replacement Trunion Assembly for Stemple STG pattern trunions:  STG U-9mm, STG 76, STG 76W, & STG 34k Includes ejector, lock nut, and retaining pins.

STG-U-34k/76/76W Buffer Rod

STG Buffer Rod for STG34k, 76, 76W to be used with standard Suomi mainsprings

STG34k Magazine Housing

2011 Pattern STG34k Magazine Housing (complete with magazine latch and barrel latch) The rear is also designed to fit the stocket of a Finish KP31 stock.  

Stemple Trunion U9, 76, Stemple Suomi & 34k

Standard replacement Trunion Assembly for Stemple STG Standard Bolt Setups with pin mounts: Includes ejector and retaining pins.

Ejector U9, 76, Stemple Suomi, & 34k

Standard replacement ejector for Stemple STG pattern trunions:  STG U-9mm, STG 76, STG 76W, & STG 34k Includes ejector blade and retaining pin.

Semi Auto Trigger Adapter (Housing Only)

Semi Auto Trigger Adapter: (HOUSING ONLY)   Does NOT include: AR Parts   The front of the original MG42 trigger pack must be machined (see prints), then this part is welded to the front of the original trigger pack. It is very important to...

Project Gun Pin

1/4 diameter x 1 1/4 long blued clevis pins   These are very useful for joining parts for project guns.    

Suomi Rear Cap Mount with Buffer

  Assembly for mountain a Suomi buffer with having to thread the the rear of your receiver.  This is the setup we used to mount the buffer in our early STG34k guns.   This assembly includes: - 1 M31 buffer - 1 BRP rear tab: this part...

KP31 Barrel Shim - .003 thick

Copied from original parts and made from stainless steel.   Thickness .003"   This part tightens the barrel to jacket fit by 'shimming' the rear collar of the barrel.   This is a very useful part for accurizing you gun or just fixing...

AR Handguard Foregrip

AR Handguard Foregrip:  Simply uses screws and nuts to attach to standard A2 and M4 handguards (mounting parts included).   Also fits 2008-2010 pattern shrouds for STG34k and STG76