Bolt Carrier Groups
Discover top-quality Heckler and Koch bolt carrier groups at HK Parts, including the HK MP5 bolt carrier, HK G3 bolt carrier, and HK93 bolt carrier. Explore our selection of full auto bolt carriers, enhanced bolt carriers, and tungsten-filled bolt carriers for models like the HK416, HK91, and HK MR556. Ensure reliability with factory HK bolt carriers and US-made bolt carriers. Shop now for chrome-lined bolt carriers, firing pin assemblies, and complete bolt heads to maintain 922r compliance and superior performance.
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Out Of StockOn Sale
HK UMP Caliber Conversion to 9mm Kit - 16.5" Barrel - 30 Round Magazine
Michaels Machines
Now: $800.96Was: $889.95HK UMP 9mm Conversion Kit - US-Made UMP/USC conversion kit will convert existing USC-UMP conversions to 9mm. This is a simple drop-in conversion for those who have already done the USC-UMP conversion. The conversion parts are drop-in, with the total swap...Now: $800.96Was: $889.95 -
Out Of StockOn Sale
HK21, PSG1, MSG90 Extractor - Factory - 7.62x51 and .308 - 5.56 and .223
H&K Heckler & Koch
Now: $116.95Was: $129.95HK21E, 11E, PSG1, MSG90 Factory German HK ExtractorNow: $116.95Was: $129.95 -
On Sale
HK MP5 Complete Bolt Head - 10mm / .40 S&W
RCM
Now: $190.75Was: $211.95HK 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 that custom build. Each bolt head will work and fit on...Now: $190.75Was: $211.95 -
On Sale
HK91, G3, PTR Bolt Head Complete - Used
H&K Heckler & Koch
Now: $59.21Was: $99.95German HK G3 & HK 91 & PTR Bolt Head Complete - Used German Date Coded Made in Germany. Each used bolt head is complete with all parts installed & 100% functional. Taken from live demilled German HK G3 rifles. Each bolt head is in good shape...Now: $59.21Was: $99.95 -
On Sale
HK G36 Bolt Carrier
GSG9
Now: $447.25Was: $496.95HK G36 Bolt Carrier with Handle Compatible With: G36 G36K G36C Will NOT work with a HK SL8Now: $447.25Was: $496.95 -
On Sale
HK MSG90 Locking Roller -4 - 7.96mm Set -Titanium
H&K Heckler & Koch
Now: $296.95Was: $329.95MSG90 (7.62x51/.308) -4 Rollers 7.96mm Set -Titanium Half moon rollers. Please Note: The price listed is per roller. Order 2 (pair) for a complete set for the bolt head. An easy way to remember the size you need to order - plus-size rollers...Now: $296.95Was: $329.95 -
On Sale
HK MP5, MP5K Stop Pin For Recoil Rod
H&K Heckler & Koch
Now: $13.49Was: $14.99HK German MP5 & MP5K Recoil Rod Stop Pin New HK German manufacture a great spare or replacement item to have on hand. Compatible With: MP5, 94, SP5 MP5K, SP89, SP5KClones or other custom buildsNow: $13.49Was: $14.99 -
HK UMP (.40 S&W) Conversion Kit - Used
H&K Heckler & Koch
$1,087.95HK UMP .40 Caliber Conversion Kit This UMP conversion kit provides the necessary components to convert .45 sub-guns to .40 caliber. Machined bolt carriers are available for USC/UMP conversion sub-guns. This is a simple, drop-in conversion requiring a...$1,087.95 -
On Sale
HK UMP Bolt Group - .40 S&W - Used
H&K Heckler & Koch
Now: $477.95Was: $649.95German UMP .40 factory F/A Bolt Group - Complete This item is used in very good shape.Now: $477.95Was: $649.95 -
On Sale
HK23E Locking Piece #20 - 70 Degree
RCM
Now: $44.96Was: $49.95New US-Made #20 Locking Piece - 70 Degree For HK23E New US-manufactured RCM # 20 70-degree locking piece for HK23E and other custom builds. Made from the finest ordnance grade steel and heat treated to perfection. A perfect spare for your...Now: $44.96Was: $49.95 -
On Sale
HK PSG1, MSG90 Ejector Lever
H&K Heckler & Koch
Now: $71.95Was: $79.95Heckler and Koch Ejector Lever for HK PSG1, MSG90 German-made ejector lever for PSG1 and MSG90 platforms. Direct replacement part built to original factory-spec for reliable extraction and correct bolt head function. Compatible With: PSG1, MSG90Now: $71.95Was: $79.95 -
On Sale
HK MP5 40/10 Recoil Rod Bushing
H&K Heckler & Koch
Now: $8.96Was: $9.95New HK German MP5 40/10/.357 Recoil Rod Guide Ring Bushing For all MP5 40/10 & MP5F Recoil Rods. These will wear and become brittle and torn with age and use. A great item to have on hand for spare parts.Now: $8.96Was: $9.95