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

Quick view Details

sku: 9mmSMGGauge

9mm SMG Chamber and Headspace Gauge

MSRP:

Now: $36.00

Add to Cart
Compare
Quick view Details

sku: 230911-01

Lot: Large Grouping of Low Grade Finnish KP31 Rear Sights

MSRP:

Now: $55.00

Add to Cart
Compare
Quick view Details

sku: 3110-shroudshim.01

KP31 Shroud Shim - .01" thick

MSRP:

Now: $4.85

Add to Cart
Compare
Quick view Details

sku: 3110-16-SA

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

MSRP:

Now: $135.00

View Details
Compare
Quick view Details

sku: 191204-01

Torch Cut KP31 Suomi Receiver

MSRP:

Now: $30.00

View Details
Compare
Quick view Details

sku: 3106-worn

M31 Bolt (full auto - original - worn condition)

MSRP:

Now: $75.00

View Details
Compare
Quick view Details

sku: 3110

KP31 Barrel - original - excellent condition

MSRP:

Now: $150.00

View Details
Compare
Quick view Details

sku: 3110-shshim-.002

KP31 Shroud Shim - .002" thick

MSRP:

Now: $4.85

Add to Cart
Compare
Quick view Details

sku: 3130-kp

KP31 Trigger Pack

MSRP:

Now: $75.00

Add to Cart
Compare
Quick view Details

sku: 3133-36

Suomi 36 rd stick magazine

MSRP:

Now: $28.50

View Details
Compare
Quick view Details

sku: 3130spring

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

MSRP:

Now: $5.20

Add to Cart
Compare
Quick view Details

sku: 3110-a-.001

KP31 Barrel Shim - .001 thick

MSRP:

Now: $2.75

Add to Cart
Compare
Quick view Details

sku: 3110-shroudshim.005

KP31 Shroud Shim - .005" thick

MSRP:

Now: $4.85

Add to Cart
Compare
Quick view Details

sku: 3108-N

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

MSRP:

Now: $14.00

Add to Cart
Compare
Quick view Details

sku: 3110-12.75

Stemple STG 9mm Barrel 12.75"

MSRP:

Now: $160.00

Add to Cart
Compare
Quick view Details

sku: U-M31CP

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

MSRP:

Now: $220.00

Add to Cart
Compare
Quick view Details

sku: U-M31P

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

MSRP:

Now: $220.00

Add to Cart
Compare
Quick view Details

sku: 011111-11

Suomi Rear Cap Mount with Buffer

MSRP:

Now: $12.00

Add to Cart
Compare
Quick view Details

sku: 3110-a

KP31 Barrel Shim - .003 thick

MSRP:

Now: $2.75

Add to Cart
Compare
Quick view Details

sku: 3137

Suomi KP31 / Swed M37 Screws: Stock and Trigger

MSRP:

Now: $19.95

View Details
Compare
Quick view Details

sku: 3134

Suomi Drum Tool

MSRP:

Now: $4.50

Add to Cart
Compare
Quick view Details

sku: 3128

KP31 Rear Buffer Cap

MSRP:

Now: $15.00

Add to Cart
Compare
SALE

Quick view Details

sku: 3125

Finnish KP31 Rear Sight

MSRP:

Was: $18.50

Now: $14.25

Add to Cart
Compare
Quick view Details

sku: 3120

M31 Charging Handle Assembly

MSRP:

Now: $18.50

Add to Cart
Compare
Quick view Details

sku: 3115

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

MSRP:

Now: $6.50

Add to Cart
Compare
Quick view Details

sku: 3112-comp

M31 Barrel Shroud - Comp

MSRP:

Now: $45.00

View Details
Compare
Quick view Details

sku: 3111s

M31 Barrel Shroud - Slant

MSRP:

Now: $55.00

Add to Cart
Compare
Quick view Details

sku: 3110-worn

KP31 Barrel - original / used - Worn Finish

MSRP:

Now: $85.00

View Details
Compare
Quick view Details

sku: 3108

M31/37 Mainspring

MSRP:

Now: $10.00

Add to Cart
Compare

Quick view

sku: 9mmSMGGauge

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
Quick view

sku: 230911-01

Lot: Large Grouping of Low Grade Finnish KP31 Rear Sights

Original Suomi - Tikka mfg 500m tangents Blems as pictured 8 complete 10 extra plate / slides extra sight springs

MSRP:

Now: $55.00
Add to Cart Compare
Quick view

sku: 3110-shroudshim.01

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
Quick view

sku: 3110-16-SA

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...

MSRP:

Now: $135.00
View Details Compare
Quick view

sku: 191204-01

Torch Cut KP31 Suomi Receiver

Original Finnish KP31 Torch Cut Receiver The cuts are severe as pictured.

MSRP:

Now: $30.00
View Details Compare
Quick view

sku: 3106-worn

M31 Bolt (full auto - original - worn condition)

complete with extractor Overall worn but useable condition

MSRP:

Now: $75.00
View Details Compare
Quick view

sku: 3110

KP31 Barrel - original - excellent condition

Original Barrel with Excellent Bluing Lands and Grooves very good to excellent as well

MSRP:

Now: $150.00
View Details Compare
Quick view

sku: 3110-shshim-.002

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
Quick view

sku: 3130-kp

KP31 Trigger Pack

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

MSRP:

Now: $75.00
Add to Cart Compare
Quick view

sku: 3133-36

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...

MSRP:

Now: $28.50
View Details Compare
Quick view

sku: 3130spring

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
Quick view

sku: 3110-a-.001

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
Quick view

sku: 3110-shroudshim.005

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
Quick view

sku: 3108-N

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
Quick view

sku: 3110-12.75

Stemple STG 9mm Barrel 12.75"

12.75" barrel for BRP Stemple Takedown Guns. FULL AUTO CHAMBER SPEC. 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...

MSRP:

Now: $160.00
Add to Cart Compare
Quick view

sku: U-M31CP

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
Quick view

sku: U-M31P

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
Quick view

sku: 011111-11

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
Quick view

sku: 3110-a

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
Quick view

sku: 3137

Suomi KP31 / Swed M37 Screws: Stock and Trigger

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

MSRP:

Now: $19.95
View Details Compare
Quick view

sku: 3134

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
Quick view

sku: 3128

KP31 Rear Buffer Cap

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

MSRP:

Now: $15.00
Add to Cart Compare
SALE

Quick view

sku: 3125

Finnish KP31 Rear Sight

Original Suomi - Tikka mfg 500m tangent

MSRP:

Was: $18.50

Now: $14.25
Add to Cart Compare
Quick view

sku: 3120

M31 Charging Handle Assembly

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

MSRP:

Now: $18.50
Add to Cart Compare
Quick view

sku: 3115

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
Quick view

sku: 3112-comp

M31 Barrel Shroud - Comp

Original M31 Barrel Shroud with Compensated Front in Very Good Condition

MSRP:

Now: $45.00
View Details Compare
Quick view

sku: 3111s

M31 Barrel Shroud - Slant

Original M31 Barrel Shroud with Slant Front in Excellent Condition

MSRP:

Now: $55.00
Add to Cart Compare
Quick view

sku: 3110-worn

KP31 Barrel - original / used - Worn Finish

Original Barrel with Worn Bluing and Some Blems as Pictured Lands and Grooves show signs of wear but useable

MSRP:

Now: $85.00
View Details Compare
Quick view

sku: 3108

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