RCM

Each barrel is finely and painstakingly made from ordnance grade steel, heat treated and finished inside and out in the ultra-desirable nitride finish. This is the finest replacement barrel...

HK G3, 91, PTR HK Custom Builds or clones HK 21E. seriesThese are also the best LP to use when using a suppressor on your HK91, G3 style of firearm.

#9 40 Degree Locking Piece - US MadeWorks with both .223 and 308 applications. HK 21e HK 23e

New US Made #20 Locking Piece - 70 Degree For HK23ENew US manufactured RCM # 20 70 degree locking piece for HK23E and other custom builds. Made from the finest ordnance grade steel and heat treated...

HK51K CHF Barrel Made from the exact HK51K barrel specifications and cold hammer forged steel as HK German barrels. Perfect for custom builds and HK51K style builds. Specifications: U.S. Made Barrel...

HK51 Barrel - Cold Hammer Forged Made to the correct HK51 barrel specifications using HK's tried and true cold hammer forged process.  Specifications: U.S. Made Barrel counts as one...

US made RCM manufactured #18 Locking Piece - 50 Degree The #18 LP is the factory correct locking piece for G3K style builds or other custom builds. The locking piece is the timing mechanism that a...

HK G3K Barrel Made from the exact G3K barrel specifications and material. Direct replacement for your shot-out G3K barrel or for that HKG3K build. Counts as one US compliance part as well...

RCM HK 53 Locking Piece #3 - 58 Degree US made by RCM #3 Locking Piece - 58 Degree - US Made This is the proper locking piece for the HK33K and HK53 firearms as well as some HK51 builds.

HK #15 Locking Piece -65 degree The #15 LP is the correct locking piece for the HK53 and several other custom build applications. The locking piece is the timing mechanism that a delayed roller lock...

New US Made HK RCM HK 93, HK 33, HK 53 .223/556 Extractor. Each unit is made with an enhanced material and polished for optimum feeding and extraction. This is simply the finest HK93,33,53 extractor...

HK 93/33 Cold Hammer Forged Barrel New CHF HK93/33 16" barrel nitrated US-manufactured barrel. These are the finest US-made barrels available and come highly recommended by HKParts. Features: 100%...

New US Made HK53K Cold Hammer Forged BarrelFeatures Machined & Manufactured 100%  in the USA Threaded 15 X 1 Right Hand 922r Compliant Counts as 1 US made part Cold Hammer Forged Steel Built to...

RCM HK 53 (5.56 / .223) 8.3 inch Barrel These are the finest US-made barrels available and come highly recommended by HKPARTS. Machined 100% in the USA, 922r compliant, and counts as 1 US-made part...

HK 33K Cold Hammer Forged Barrel Features: Machined in the USA 922r Compliant Cold Hammer Forged Steel Built to HK Germany Specifications Nitride Finish  Specifications: Overall Length...

HK53 length .300 Blackout Barrel- 5/8"- 24 Thread- 8.20" Overall LengthEach barrel was designed for use with the wildly popular AAC style quick detach muzzle breaks and cans in the 5/8" -24 thread...

New US Made 53 Degree #8 Locking Piece For the HK 93, 33, C93 & V93 Rilfes. Made 100% in the USA from ordnance grade steel, heat treated and made to last. A pefect upgrade for your well used or...

New US Made 55 Degree #7 Locking Piece For the HK 93, 33, C93 & V93 Rilfes. Made 100% in the USA from ordnance grade steel, heat treated and made to last. A pefect upgrade for your well used or...

HK 93, 33, 53 .223/556 Bolt Head Complete - USThe latest generation style bolt head with oval shaped roller retainer plate. Perfect for 556/ .223 & 300 BLK HK or roller lock firearms.Comes...

New US Made HK 33K length 12.5" .300 Blackout Barrel- 5/8"- 24 Each barrel was designed for use with the wildly popular AAC style quick detach muzzle breaks and cans in the 5/8" -24 thread pitch...

New US Made HK Full length 16.125" .300 Blackout Barrel- 5/8"- 24 Each barrel was designed for use with the wildly popular AAC style quick detach muzzle breaks and cans in the 5/8" -24 thread pitch...

300 BLK Locking PieceNew US manufactured 300 BLK locking piece for custom 300 builds or other custom 300 BLK  HK style roller locked firearms.

MP5K 40/10 Full Auto Bolt Carrier - Latest Upgraded Version This part is built from billet ordnance steel. This US-made MP5K 40,10 style carrier is made with Tungsten and is heat-treated,...

  HK MP5 40/10 Bolt Head Complete - RCM- US Each bolt head incorporates the same enhanced material as all of the new RCM products. Ideal to replace out of spec, worn or broken bolt heads or for...

MP5 40 & MP5 10mm High Impulse Locking Piece Marked #25Made in the US from an enhanced material and heat treated to factory specifications. Each US made MP5 40/10 60 Degree Locking Piece Is Used...

MP5 40, 10mm - Full Auto Bolt Carrier Machined completely from billet ordnance steel. This carrier is made to the latest specs and are Tungsten filled and heat treated providing the finest American...

MP5 40 & 10mm Extractor - US Made This part is made to the exact same specs as the HK German extractor final polish included. It is also a great upgrade for the clone CA and Vector builds.

RCM MP5 40/10 Low Impulse Locking Piece #24 MP5 40 & MP5 10mm US Made RCM Low Impulse Locking Piece Marked (Low #24) For the MP5 40 or 10mm Firearms. Made out of enhanced material and heat...

MP5K Reverse Stretch- Trunion US-made to exact factory HK specifications for the HK MP5K, SP89 9mm builds. There is a difference between the MP5K and the MP5 trunion. This offering is the correct...

MP5K, SP89 Locking Piece - 110 Degree - RCM US-Made Locking Piece. Made from ordnance grade steel, heat treated, and made to last by RCM. HK no longer makes the 110-degree locking piece as they use...

MP5K Full Auto Bolt Carrier - US- Made - RCM This part is machined from billet ordnance steel. Our US-made MP5K carrier is made to the most updated and latest MP5K F specs. Tungsten filled, heat...

Premium Cold Hammer Forged HK MP5K 3-Lug 9mm Barrel It is the only US-made barrel using the same steel and CHF process that Heckler & Koch uses themselves. Precision milled to the latest...

HK SP5K Specification Full Auto Bolt Carrier - US Made Machined completely from billet ordnance grade steel. The HK SP5K carrier is made to the most updated and latest MP5K F specs that will fit the...

RCM MP5-SD 9mm Locking Piece - 115 Degree This locking piece is a US-made version of the factory German MP5SD 115-degree locking piece. Each locking piece is made 100% here in the USA with ordnance...

Made in the USA of Cold Hammer Forged (CHF) Steel. This is the highest quality, best valued US made MP5-N barrel available. This high quality barrel is processed using the highly desirable Nitrite...

HK MP5, MP5K 9mm Bolt Head Incomplete/Stripped MP5, MP5K 9mm New "action 3 style" made to the same specs & tolerances as the latest HK German bolt heads.Compatible with all: HK MP5,94 HK MP5K,...

RCM MP5, HK94 & MP5K 100 Degree Locking Piece Each 100-degree MP5 locking piece is the proper, correct locking piece for all HK MP5/94 and full-size clones as well as this is now the correct...

HK MP5, 94, MP5K, & SP89 9mm - Complete Bolt Head Each bolt head incorporates a mixture of the finest quality US-made and factory German HK parts, making a new complete bolt head ready for use...

RCM MP5 9mm Trunion US made to exact factory HK specifications and machined completely from ordnance grade steel and heat treated to factory specs.  Compatible with: MP5, 94 MP5K SP89 Clones...

MP5 9mm Full Auto Bolt Carrier - RCM New US RCM manufactured MP5, 94 F/A carrier with all current "F" style upgrades and tungsten filled for the best performance and the utmost reliability. They were...