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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On Sale
HK UMP Armorer Manual - 9mm / .40 S&W / .45 ACP
HKP HK Parts
Now: $15.95Was: $19.95HK UMP Armorer Manual This is the most in-depth manual available for the UMP series and covers the UMP 45, 40, & 9mm calibers. It has 64 Pages with diagrams and in-depth coverage of the history and full mechanical diagrams of the UMP firearm.HKP-00612Now: $15.95Was: $19.95 -
On Sale
HK MP5SD Barrel Port Cleaning Brush Replacement Cartridge
HKP HK Parts
Now: $30.95Was: $38.75HKP MP5SD Replacement Cartridge for Barrel Port Brush Replacement cartridge for HK MP5SD barrel port brush. Our replacement cartridge is compatible with factory HK barrel brush assemblies. Compatible With: HK MP5SDHKP-21294Now: $30.95Was: $38.75 -
On Sale
HK VP9L Railok™ Compensator
HKP HK Parts
Now: $129.95Was: $189.95HK Parts Railok™ Mounting System Compensator: H&K VP9L The HK Parts Railok™ mounting system compensator strikes a seamless balance of form and function. Users will immediately notice the reduction in muzzle flip and recoil,...HKP-21253Now: $129.95Was: $189.95 -
HK UMP Magazine Body - .45 ACP - 25 Round
HKP HK Parts
$34.95UMP 45 25 Round Magazine Body Only - USA Made New US made UMP .45 cal 25 Round Factory Mag Body. Each magazine body will fit all HK UMP factory firearms as well as the HK USC's that have been converted to accept UMP magazines. Each magazine is made in...HKP-17020$34.95 -
On Sale
HK G3K Locking Piece #18 - 50 Degree
RCM
Now: $41.95Was: $49.95RCM HK G3K Locking Piece #18 - 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 delayed roller lock firearm uses to tell the firearm when to unlock and...HKP-02522Now: $41.95Was: $49.95 -
On Sale
HK Universal Angled Fore Grip - M-LOK
Magpul
Now: $23.95Was: $28.95Magpul - M-LOK AFG (Angled Fore Grip) The Magpul M-LOK AFG (Angled Fore Grip) is the result of research and refinements done to the original AFG and AFG-2. By integrating the direct-attach M-LOK mounting system with minimalist construction we were able...HKP-17267Now: $23.95Was: $28.95 -
Out Of Stock
HK MP5, MP5K, APC Muzzle Brake - Quick Detach - 3 Lug - 9mm
B&T Brugger & Thomet
$140.00B&T HK MP5/MP5K Quick Detach Muzzle Brake - 3-Lug B&T Swiss manufactured QD muzzle brake for HK tr-lug pattern firearms. Specifications: Diameter 31 mm Length 73 mm Steel QPQ Treated Quick Detach Compatible With: HK MP5, MP5K HK SP5,...HKP-16898$140.00 -
On Sale
HK USP International Holster - Comp Carry
Comp-Tac
$75.95 - $80.95Comp-Tac HK USP International Comp Carry Holster The International Holster is an outside-the-waistband holster with a modular mounting design, giving the user 16 holster options in 1. Designed to be worn in the 3 o'clock position, this holster is perfect...HKP-21121-M$75.95 - $80.95 -
HK MP5K, SP5K, HK91, G3 Series Binary Trigger - Curved - BFSIII
FA Franklin Armory
$629.99Franklin Armory BFSIII HK-C1 Binary Trigger Pack for HK MP5K, HK SP5K, HK91, and HK G3 The BFSIII™ for HK is a 3-Position Trigger. In position 3 it will fire 1 round on Pull and 1 round on Release. This makes it the fastest semi-automatic trigger...HKP-18434$629.99 -
HK MP5 Flash Hider - 9mm - 3 Lug
H&K Heckler & Koch
$157.95HK Heckler and Koch's 9mm Flash Hider - 3-Lug This part attaches to the end of any factory specification 9mm 3-lugged barrel. This flash hider does not require the use of threads as it attaches to the 3-lug tip, this is also a great addition for any of...HKP-00082$157.95 -
On Sale
Compensator Delete Plate - Picatinny Rail
HKP HK Parts
Now: $10.46Was: $18.95HKP Compensator Picatinny Rail Delete Plate The HK Parts compensator picatinny rail delete plate quickly replaces the picatinny rail for a no-snag, sleeker execution. This offering is not compatible with Rail Mount Compensators with ported holes located...HKP-21317-MNow: $10.46Was: $18.95 -
On Sale
AR-15 Super Safety - Forced Reset Selector - Single Lever
Atrius
Now: $179.95Was: $199.95Atrius Single Lever Forced Reset Selector for AR-15 Style Firearms The Atrius Forced Reset Selector gives AR-15 users three selector positions: SAFE, SEMI, and FULL SEMI. It is designed for mil-spec fire control groups in .223, 5.56, and 300 BLK and...HKP-22348Now: $179.95Was: $199.95