Parts
At HK Parts, we offer a wide range of high-quality Heckler and Koch accessories and components for your favorite firearms. Whether you are upgrading a Heckler and Koch pistol or rifle, or building with parts kits, we have you covered. Explore top-rated components for VP9, USP, P30, MP5, MP5K, G36, HK416, and more. From triggers, barrels, and grips to magazines, stocks, and sights, find the parts you need to enhance performance, reliability, and function.
Popular upgrades include match triggers, threaded barrels, compensators, optic plates, and extended magazines. Rifle owners often add enhanced stocks, forearms, and ambidextrous controls.
MP5 and MP5K kits are top sellers, giving shooters authentic components for iconic builds. G36 and HK416 kits are also highly sought after by collectors and professionals alike.
HKP offers the world’s largest H&K-focused catalog, with better availability, faster fulfillment, and expert support compared to general retailers.
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Out Of Stock
HK UMP Barrel - 9mm - Standard
HKP HK Parts
$299.95HK UMP 9mm Barrel US made replica of the HK UMP 9mm barrel. Counts as one US made compliant part as an added bonus.HKP-18640$299.95 -
Out Of Stock
HK UMP Bolt Group - Semi Auto - 9mm
HKP HK Parts
$369.95HK UMP 9mm -Semi-Auto Bolt Group The semi-auto bolt group is required for HK USC to HK UMP caliber conversions. The full-auto bolt carrier will not work in HK USC rifles. Includes: Extractor Firing pin Retaining Pin Firing pin &...HKP-18752$369.95 -
HK USC Magazine Floorplate - .45 ACP
H&K Heckler & Koch
$8.95H&K USC (.45 ACP) Magazine Floor PlateHKP-16380$8.95 -
Out Of Stock
HK UMP Paddle Magazine Release
$9.95UMP Paddle Magazine Release - US Made New UMP Mag release. This is a very common repair & replacement part as they are fairly easy to break on the UMP lower. Simple & easy to install no gunsmith needed or required. Compatible With: UMP .45 UMP ...HKP-18773$9.95 -
Out Of Stock
HK UMP Conversion Kit - 9mm - Threaded 1/2x28
HKP HK Parts
$679.95HKP HK UMP 9mm Conversion Kit -Threaded 1/2x28 9mm UMP/USC conversion kit will convert existing USC-UMP conversions to 9mm. This is a simple drop-in conversion for those that have already done the USC-UMP conversion. The conversion parts are drop in with...HKP-02287$679.95 -
Out Of Stock
HK UMP (.40 S&W/.45 ACP/9mm) 4 Position Burst Lower (0,1,2,Full)
H&K Heckler & Koch
$0.00New HK German 4 Position (0,1,2,Full) Burst LowerFits All HK UMP's. This item can be adapted for use on the USC-UMP Conversion if the F/A internals are removed & the USC (semi-auto) internals are installed. This item is a very popular item for the...HKP-00593$0.00 -
Out Of Stock
HK UMP, USC Ejector Lever
$34.95HK UMP, USC Ejector Lever A great spare to have on hand as they are prone to shearing off with use and must be replaced. Perfect for the Omega and Tommy Built Tactical builds. Compatible With: UMP .45 UMP .40 UMP 9mm USC .45 and all caliber of...HKP-18508$34.95 -
Out Of Stock
HK USC Magazine Body - .45 ACP - 10 Round - Straight - Factory
H&K Heckler & Koch
$0.00HK USC .45 10 Round Magazine Body. This is the only magazine body that HK offers for the HK USC. Compatible With: HK USC CarbinesHKP-16370$0.00 -
Out Of Stock
MM HK 21 (7.62x51/.308) Trunnion
H&K Heckler & Koch
$0.00US Made HK21 Trunnion By Michael's Machine (MM) These are the finest US-made trunnions available.HKP-00246$0.00 -
Out Of Stock
HK23E Extractor Spring
H&K Heckler & Koch
$0.00HK23E Factory German Extractor Spring Rare and hard to find. This is a new HK German part.HKP-00819$0.00 -
Out Of Stock
HK11, HK13, HK21E, HK23E Vertical Foregrip - Assault
H&K Heckler & Koch
$0.00New HK German Assault Grip This vertical grip mounts directly to the front shroud and can be mounted at several angles depending on the shooter's option. This item is no longer available or in production. Compatible With: HK 21e HK 23e HK 11 HK...HKP-00574$0.00 -
Out Of Stock
HK21E Feed Mechanism - Incomplete
H&K Heckler & Koch
$0.00HK21E Partial Feed Mechanism. Comes complete minus the top shelf & pin as shown. New HK date coded complete & German. We have been told these are the last units available.HKP-01019$0.00