<![CDATA[BRP CORP: New Products - Finnish KP31 Individual Parts]]> https://www.brpguns.com Tue, 09 Jun 2026 17:11:08 +0000 <![CDATA[9mm SMG Chamber and Headspace Gauge]]> https://www.brpguns.com/9mm-smg-chamber-and-headspace-gauge/ Tue, 14 May 2024 08:05:45 +0000 https://www.brpguns.com/9mm-smg-chamber-and-headspace-gauge/ 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 compared to c..

Price: $36.00

]]> 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 compared to c..

Price: $36.00

]]> 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 compared to c..]]> <![CDATA[KP31 Shroud Shim - .01" thick]]> https://www.brpguns.com/kp31-shroud-shim-01-thick/ Fri, 30 Dec 2022 17:13:16 +0000 https://www.brpguns.com/kp31-shroud-shim-01-thick/ 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 accu..

Price: $4.85

]]> 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 accu..

Price: $4.85

]]> 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 accu..]]> <![CDATA[KP31 Suomi SEMI AUTO HEADSPACE pattern 9mm Barrel 16" Threaded 1/2-28]]> https://www.brpguns.com/copy-of-stemple-stg-9mm-barrel-16-threaded-1-2-28/ Thu, 30 Jul 2020 13:42:43 +0000 https://www.brpguns.com/copy-of-stemple-stg-9mm-barrel-16-threaded-1-2-28/ 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..

Price: $135.00

]]> 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..

Price: $135.00

]]> 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..]]> <![CDATA[M31 Bolt (full auto - original - worn condition)]]> https://www.brpguns.com/copy-of-m31-bolt-full-auto-original-excellent-condition/ Wed, 20 Nov 2019 09:00:29 +0000 https://www.brpguns.com/copy-of-m31-bolt-full-auto-original-excellent-condition/ M31 Bolt (full auto - original - worn condition)

complete with extractor

Overall worn but useable condition

Price: $75.00

]]> M31 Bolt (full auto - original - worn condition)

complete with extractor

Overall worn but useable condition

Price: $75.00

]]> complete with extractor

Overall worn but useable condition

]]> <![CDATA[KP31 Barrel - original - excellent condition]]> https://www.brpguns.com/kp31-barrel-original-excellent-condition/ Wed, 20 Nov 2019 08:57:23 +0000 https://www.brpguns.com/kp31-barrel-original-excellent-condition/ KP31 Barrel - original - excellent condition

Original Barrel with Excellent Bluing

Lands and Grooves very good to excellent as well

 

Price: $150.00

]]> KP31 Barrel - original - excellent condition

Original Barrel with Excellent Bluing

Lands and Grooves very good to excellent as well

 

Price: $150.00

]]> Original Barrel with Excellent Bluing

Lands and Grooves very good to excellent as well

 

]]> <![CDATA[KP31 Shroud Shim - .002" thick]]> https://www.brpguns.com/copy-of-kp31-shroud-shim-005-thick/ Thu, 23 Feb 2017 15:02:55 +0000 https://www.brpguns.com/copy-of-kp31-shroud-shim-005-thick/ 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 acc..

Price: $4.85

]]> 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 acc..

Price: $4.85

]]> 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 acc..]]> <![CDATA[KP31 Trigger Pack]]> https://www.brpguns.com/copy-of-stemple-u9-trigger-pack-1/ Fri, 04 Nov 2016 19:48:57 +0000 https://www.brpguns.com/copy-of-stemple-u9-trigger-pack-1/ KP31 Trigger Pack

M31 / KP31 Trigger Pack 

NOT FOR SEMI AUTO US-MADE GUNS.

Price: $75.00

]]> KP31 Trigger Pack

M31 / KP31 Trigger Pack 

NOT FOR SEMI AUTO US-MADE GUNS.

Price: $75.00

]]> M31 / KP31 Trigger Pack 

NOT FOR SEMI AUTO US-MADE GUNS.

]]> <![CDATA[Suomi 36 rd stick magazine]]> https://www.brpguns.com/copy-of-suomi-drum/ Tue, 09 Aug 2016 17:49:58 +0000 https://www.brpguns.com/copy-of-suomi-drum/ 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 y..

Price: $30.00

]]> 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 y..

Price: $30.00

]]> 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 y..]]> <![CDATA[Suomi KP31, Swed M37, Stemple U9 Trigger Pack Sear Spring]]> https://www.brpguns.com/copy-of-stemple-u9-trigger-pack/ Wed, 04 May 2016 16:41:32 +0000 https://www.brpguns.com/copy-of-stemple-u9-trigger-pack/ 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

Price: $5.20

]]> 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

Price: $5.20

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

]]> <![CDATA[KP31 Barrel Shim - .001 thick]]> https://www.brpguns.com/kp31-barrel-shim-001-thick/ Sat, 26 Mar 2016 19:52:17 +0000 https://www.brpguns.com/kp31-barrel-shim-001-thick/ 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 barre..

Price: $2.75

]]> 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 barre..

Price: $2.75

]]> 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 barre..]]>