Parts and Kits Web Store - Suomi KP31 & Swed 37 SMG - Finnish KP31 Individual Parts

Shop by Category

Finnish KP31 Individual Parts

9mm SMG Chamber and Headspace Gauge

MSRP:

Now: $36.00

Add to Cart
Compare
KP31 Shroud Shim - .01" thick

MSRP:

Now: $4.85

Add to Cart
Compare
KP31 Shroud Shim - .002" thick

MSRP:

Now: $4.85

Add to Cart
Compare
KP31 Trigger Pack

MSRP:

Now: $75.00

Add to Cart
Compare
Suomi KP31, Swed M37, Stemple U9 Trigger Pack Sear Spring

MSRP:

Now: $5.20

Add to Cart
Compare
KP31 Barrel Shim - .001 thick

MSRP:

Now: $2.75

Add to Cart
Compare
KP31 Shroud Shim - .005" thick

MSRP:

Now: $4.85

Add to Cart
Compare
Mainspring STG U9, 34k, & Suomi - New Production

MSRP:

Now: $14.00

Add to Cart
Compare
STG Universal Barrel Shroud - M31 Compensated Front (LONG PICATINNY RAIL)

MSRP:

Now: $220.00

Add to Cart
Compare
STG Universal Barrel Shroud - M31 Slant Front (LONG PICATINNY RAIL)

MSRP:

Now: $220.00

Add to Cart
Compare
Suomi Rear Cap Mount with Buffer

MSRP:

Now: $12.00

Add to Cart
Compare
KP31 Barrel Shim - .003 thick

MSRP:

Now: $2.75

Add to Cart
Compare
Suomi Drum Tool

MSRP:

Now: $4.50

Add to Cart
Compare
KP31 Rear Buffer Cap

MSRP:

Now: $15.00

Add to Cart
Compare
SALE

Finnish KP31 Rear Sight

MSRP:

Was: $18.50

Now: $14.25

Add to Cart
Compare
M31 Charging Handle Assembly

MSRP:

Now: $22.50

Add to Cart
Compare
M31/37 Barrel Jacket Latch - 1 latch and 1 bushing included

MSRP:

Now: $6.50

Add to Cart
Compare
M31/37 Mainspring

MSRP:

Now: $10.00

Add to Cart
Compare

9mm SMG Chamber and Headspace Gauge

9mm SMG Chamber Wear and Headspace Gauge To ensure the safe operation of 9mm Fixed-Firing-Pin (FFP) Blow-Back (BB) Submachine Guns (SMGs), chamber wear and headspace should be verified. Since SMGs don't typically show a lot of bore wear...

MSRP:

Now: $36.00
Add to Cart Compare
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...

MSRP:

Now: $4.85
Add to Cart Compare
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...

MSRP:

Now: $4.85
Add to Cart Compare
KP31 Trigger Pack

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

MSRP:

Now: $75.00
Add to Cart Compare
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

MSRP:

Now: $5.20
Add to Cart Compare
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...

MSRP:

Now: $2.75
Add to Cart Compare
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...

MSRP:

Now: $4.85
Add to Cart Compare
Mainspring STG U9, 34k, & Suomi - New Production

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

MSRP:

Now: $14.00
Add to Cart Compare
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...

MSRP:

Now: $220.00
Add to Cart Compare
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...

MSRP:

Now: $220.00
Add to Cart Compare
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...

MSRP:

Now: $12.00
Add to Cart Compare
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...

MSRP:

Now: $2.75
Add to Cart Compare
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.

MSRP:

Now: $4.50
Add to Cart Compare
KP31 Rear Buffer Cap

Original Rear Cap in Good Condition (some dings on the knurling)

MSRP:

Now: $15.00
Add to Cart Compare
SALE

Finnish KP31 Rear Sight

Original Suomi - Tikka mfg 500m tangent

MSRP:

Was: $18.50

Now: $14.25
Add to Cart Compare
M31 Charging Handle Assembly

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

MSRP:

Now: $22.50
Add to Cart Compare
M31/37 Barrel Jacket Latch - 1 latch and 1 bushing included

Removed from original receiver 1 latch and 1 bushing included

MSRP:

Now: $6.50
Add to Cart Compare
M31/37 Mainspring

Original Mainspring

MSRP:

Now: $10.00
Add to Cart Compare

Shop by Category

Shop by Brand

Shop by Brand

Finnish KP31 Individual Parts

9mm SMG Chamber and Headspace Gauge

KP31 Shroud Shim - .01" thick

KP31 Shroud Shim - .002" thick

KP31 Trigger Pack

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

KP31 Barrel Shim - .001 thick

KP31 Shroud Shim - .005" thick

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

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

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

Suomi Rear Cap Mount with Buffer

KP31 Barrel Shim - .003 thick

Suomi Drum Tool

KP31 Rear Buffer Cap

Finnish KP31 Rear Sight

M31 Charging Handle Assembly

M31/37 Barrel Jacket Latch - 1 latch and 1 bushing included

M31/37 Mainspring

9mm SMG Chamber and Headspace Gauge

KP31 Shroud Shim - .01" thick

KP31 Shroud Shim - .002" thick

KP31 Trigger Pack

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

KP31 Barrel Shim - .001 thick

KP31 Shroud Shim - .005" thick

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

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

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

Suomi Rear Cap Mount with Buffer

KP31 Barrel Shim - .003 thick

Suomi Drum Tool

KP31 Rear Buffer Cap

Finnish KP31 Rear Sight

M31 Charging Handle Assembly

M31/37 Barrel Jacket Latch - 1 latch and 1 bushing included

M31/37 Mainspring