Finnish KP31 Individual Parts

SUOMI M31 & Swedish M37 Coffin Mag Loader - Finnish Markings

Original Item Actual item pictured Condition as shown Includes: 1 x Coffin Mag Loader with Finnish "SA" Markings  

KP31 Shroud Shim - .01" thick

Copied from original parts and made from stainless steel.   Thickness .01"   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 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 Trigger Pack

M31 / KP31 Trigger Pack  NOT FOR SEMI AUTO US-MADE GUNS.

Suomi 36 rd stick magazine

36rd original Finnish Suomi drum. Works with M31/KP31, KP44, M37/39, M45. (not for sale where prohibited) Excellent condition       MAGAZINE SHIPPING RESTRICTIONS   California Restrictions: 10 rounds, unless you can...

Suomi KP31, Swed M37, Stemple U9 Trigger Pack Sear Spring

M31 Trigger Pack Sear Spring for original KP31 and Stemple U series guns with Suomi pattern trigger packs

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...

Mainspring STG U9, 34k, & Suomi - New Production

New Production Mainspring for Suomi KP31, Swed M37, STG 76, Stemple Suomi, STG U9, STG 34k

Stemple STG 9mm Barrel 12.75"

12.75" barrel for BRP Stemple Takedown Guns.     Extractor Location The extractor relief on this barrel is setup for the BRP-Stemple extractors and would have to be enlarged to accommodate the KP31 extractor for full auto and semi auto...

STG Universal Barrel Shroud - M31 Compensated Front (LONG PICATINNY RAIL)

M31 Compensated Barrel Shroud with new parkerized finish for use with 12.875" 9mm barrels. Picatinny rail mount on bottom of shroud. Compatible with all Universal pattern Stemple guns and original KP31 SMGs.  *** 16" barrels wil...

STG Universal Barrel Shroud - M31 Slant Front (LONG PICATINNY RAIL)

M31 Slant Barrel Shroud with new parkerize finish for use with 12.875" and 16" 9mm barrels.  The 16" barrels are threaded 1/2-28. Picatinny rail mount on bottom of shroud. Compatible with all Universal pattern Stemple guns and...

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...

Suomi KP31 / Swed M37 Screws: Stock and Trigger

Includes the trigger screw and trigger screw keeper, and stock/tang screw

Suomi Drum Tool

Fitted tool for the Suomi Drum Feeder Arm for 1/4" hex drive tool.   It allows you to remove the arm for retensioning the drum.

M31 Rear Cap

Original Rear Cap in Excellent Condition

M31 Rear Sight

Original Suomi - Tikka mfg 500m tangent

M31 Charging Handle Assembly

Original M31 Charging Assembly: includes; handle, spring, bolt catch, and pin

M31/37 Mainspring

Original Mainspring