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

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sku: 9mmSMGGauge

9mm SMG Chamber and Headspace Gauge

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Now: $36.00

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sku: 230911-01

Lot: Large Grouping of Low Grade Finnish KP31 Rear Sights

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Now: $55.00

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sku: 3110-shroudshim.01

KP31 Shroud Shim - .01" thick

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Now: $4.85

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sku: 3110-16-SA

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

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Now: $135.00

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sku: 191204-01

Torch Cut KP31 Suomi Receiver

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Now: $30.00

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sku: 3106-worn

M31 Bolt (full auto - original - worn condition)

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Now: $75.00

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sku: 3110

KP31 Barrel - original - excellent condition

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Now: $150.00

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sku: 3110-shshim-.002

KP31 Shroud Shim - .002" thick

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Now: $4.85

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sku: 3130-kp

KP31 Trigger Pack

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Now: $75.00

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sku: 3133-36

Suomi 36 rd stick magazine

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Now: $28.50

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sku: 3130spring

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

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Now: $5.20

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sku: 3110-a-.001

KP31 Barrel Shim - .001 thick

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Now: $2.75

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sku: 3110-shroudshim.005

KP31 Shroud Shim - .005" thick

MSRP:

Now: $4.85

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sku: 3108-N

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

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Now: $14.00

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sku: 3110-12.75

Stemple STG 9mm Barrel 12.75"

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Now: $160.00

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sku: U-M31CP

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

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Now: $220.00

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sku: U-M31P

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

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Now: $220.00

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sku: 011111-11

Suomi Rear Cap Mount with Buffer

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Now: $12.00

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sku: 3110-a

KP31 Barrel Shim - .003 thick

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Now: $2.75

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sku: 3137

Suomi KP31 / Swed M37 Screws: Stock and Trigger

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Now: $19.95

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sku: 3134

Suomi Drum Tool

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Now: $4.50

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sku: 3128

KP31 Rear Buffer Cap

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Now: $15.00

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sku: 3125

Finnish KP31 Rear Sight

MSRP:

Was: $18.50

Now: $14.25

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sku: 3120

M31 Charging Handle Assembly

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Now: $22.50

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sku: 3115

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

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Now: $6.50

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sku: 3112-comp

M31 Barrel Shroud - Comp

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Now: $45.00

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sku: 3111s

M31 Barrel Shroud - Slant

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Now: $55.00

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sku: 3110-worn

KP31 Barrel - original / used - Worn Finish

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Now: $85.00

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sku: 3108

M31/37 Mainspring

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Now: $10.00

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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...

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Now: $36.00
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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

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Now: $55.00
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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...

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Now: $4.85
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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...

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Now: $135.00
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sku: 191204-01

Torch Cut KP31 Suomi Receiver

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

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Now: $30.00
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sku: 3106-worn

M31 Bolt (full auto - original - worn condition)

complete with extractor Overall worn but useable condition

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Now: $75.00
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sku: 3110

KP31 Barrel - original - excellent condition

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

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Now: $150.00
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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
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sku: 3130-kp

KP31 Trigger Pack

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

MSRP:

Now: $75.00
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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...

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Now: $28.50
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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
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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
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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
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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

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Now: $14.00
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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...

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Now: $160.00
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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...

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Now: $220.00
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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...

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Now: $220.00
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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...

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Now: $12.00
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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
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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
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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
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sku: 3128

KP31 Rear Buffer Cap

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

MSRP:

Now: $15.00
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sku: 3125

Finnish KP31 Rear Sight

Original Suomi - Tikka mfg 500m tangent

MSRP:

Was: $18.50

Now: $14.25
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sku: 3120

M31 Charging Handle Assembly

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

MSRP:

Now: $22.50
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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
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sku: 3112-comp

M31 Barrel Shroud - Comp

Original M31 Barrel Shroud with Compensated Front in Very Good Condition

MSRP:

Now: $45.00
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sku: 3111s

M31 Barrel Shroud - Slant

Original M31 Barrel Shroud with Slant Front in Excellent Condition

MSRP:

Now: $55.00
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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
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sku: 3108

M31/37 Mainspring

Original Mainspring

MSRP:

Now: $10.00
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Finnish KP31 Individual Parts