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 G36K Piston Rod Assembly, Complete
GSG9
$59.95HK G36K Gas Piston Rod/Spring Assembly - USA New spring assembly that is a must have for spare parts or to use on that HK Sl8-G36 conversion. This is the proper length gas piston to be used for a 12.5" G36K style length gas block and barrel assembly...HKP-18249$59.95 -
Out Of Stock
Flash Hider - Threaded 15x1 RH - 5.56 / .223
H&K Heckler & Koch
$0.00Heckler and Koch's Factory Correct Flash Hider - Threaded 15x1 RH Fits all HK barrels. 15x1 The right-hand thread is the thread pitch. Perfect for the SL8 and G36 type conversions. Specifications: Threaded 15x1 RH Compatible With: HK416 HK MR556 HK...HKP-00952$0.00 -
Out Of Stock
HK G36 Lower Housing - 4 Position Burst Navy
H&K Heckler & Koch
$0.00H&K G36 (5.56/.223) 4 Position Burst Navy Style Lower Housing This lower housing, featuring the Navy style housing, is offered without internals. Previously, G36 lowers were only available as complete trigger groups, including both the lower grip and...HKP-02231$0.00 -
Out Of Stock
HK G36, SL8 Single Optic Carrying Handle - Used
H&K Heckler & Koch
$0.00HK German G36, SL8 Single Optic Carrying Handle In Used Shape.HKP-00806$0.00 -
Out Of Stock
HK USC Magazine Release - Extended - .45 ACP
HKP HK Parts
$24.95HK USC Alloy Mag Release - Extended Billeted alloy USC magazine release. This is a very common repair & replacement part as they are fairly easy to break on the USC lower. With this new metal mag release you get more surface area as well as a much...HKP-17918$24.95 -
Out Of Stock
HK UMP, USC Extractor - .40 S&W
USA
$39.95New US-Made USC Or UMP .40 Extractor This part is a repair and replacement item, as these are prone to breakage, and it's a part that's hard to find and a great item to have on hand. Please Note: HK considers this a high wear and replacement...HKP-02624$39.95 -
Out Of Stock
HK UMP Pistol Grip, Incomplete - 0,1,2,F
H&K Heckler & Koch
$0.00Stripped UMP Pistol Grip - 4 Position (0,1,2,D) PictogramHKP-17817$0.00 -
Out Of Stock
HK UMP Pistol Grip, Incomplete - 0,1,F
H&K Heckler & Koch
$0.00UMP Pistol Grip Stripped & Incomplete - 3 Position (0,1,F) Pictogram New German HK UMP 3 position lower.HKP-17816$0.00 -
Out Of Stock
HK UMP Pistol Grip, Incomplete - 0,1
H&K Heckler & Koch
$0.00UMP Pistol Grip Stripped & Incomplete - 2 Position (0,1) Pictogram New HK German manufacture, rare and hard to find. If you have an HK USC you can use this housing with the USC lower internals for a complete USC to UMP lower assembly that you can use...HKP-17815$0.00 -
Out Of Stock
HK UMP (.40 S&W/.45 ACP/9mm) Demilled Rear Receiver Section
H&K Heckler & Koch
$0.00HK UMP Demilled Receiver Section This is a demilled factory HK UMP rear receiver section that is perfect for the new Tom Bostic USC-UMP conversions. This section is the perfect length in order to do the USC/UMP conversion. Last one available.HKP-01659$0.00 -
Out Of Stock
HK UMP (9mm) Parts Kit
H&K Heckler & Koch
$0.00HK UMP 9mm Parts Kit - Like New Condition Click this link to complete your build with an S5 Tactical receiver. Black Ops Defense offers the full gamut of USC/UMP conversion services for factory-correct, full-German builds. Includes: Front...HKP-02425$0.00 -
Out Of Stock
HK UMP, USC Kit - Caliber Conversion - 9mm - 30 Round
HKP HK Parts
$999.95HK Parts and Heckler and Koch HK UMP and HK USC 9mm Conversion Kit - Threaded Barrel 1/2x28 - 3-Lug This UMP, USC conversion kit will convert existing conversions to 9mm. This is a simple drop-in conversion for those who have already done the USC-UMP...HKP-02285$999.95