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
HK416, MR556 14.5" Super Modular Rail System - FDE
Geissele
Now: $494.95Was: $549.95Geissele HK416, MR556 14.5" Modular Rail - Desert Dirt Color (DDC) 13.625" overall length Geissele HK 416, MR556 free float rail with HK 416 14.5" barrel and MR 556 16.5" barreled upper. This is a direct replacement item for your HK MR556 and 14.5"...HKP-16462Now: $494.95Was: $549.95 -
HK UMP, USC Bolt Catch
H&K Heckler & Koch
$58.95HK UMP & USC Bolt Catch New HK German lower. Compatible With: HK UMP HK USCHKP-01897$58.95 -
On Sale
HK53 Barrel - 5.56 / .223 - 8.275" - Threaded 15x1
RCM
Now: $139.95Was: $164.95RCM HK 53 (5.56/.223) Barrel - Threaded 15x1 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 922r compliant part. Specifications: Cold Hammer Forged...HKP-01156Now: $139.95Was: $164.95 -
On Sale
Barrel Bore Cleaning Brush - 5.56 / .223
HKP HK Parts
Now: $1.45Was: $1.95HKP Barrel Bore Cleaning Brush - 5.56 / .223 HKP barrel bore cleaning brush for 5.56 and .223 caliber HK firearms. Designed to help remove fouling and buildup from the bore during routine maintenance, this brush is a practical cleaning tool for...HKP-99476Now: $1.45Was: $1.95 -
On Sale
HK91, G3, PTR Magazine - 20 Round - Date Coded - USED
H&K Heckler & Koch
Now: $24.95Was: $34.95Heckler and Koch HK91, G3, PTR 20 Round Date Coded Magazine - USED VARYING CONDITION SHOWN - SOLD INDIVIDUALLY DENTS AND PITTING USED PARTS ARE SOLD AS IS. THIS PART IS NOT ELIGIBLE FOR RETURN. ALL USED PART SALES ARE FINAL. Factory German HK 20...HKP-99439-MNow: $24.95Was: $34.95 -
On Sale
HK MP5, SP5 Faux Suppressor - KAC Style - 1/2x28
MFI
Now: $117.95Was: $138.95HK MP5, SP5 KAC Style Faux Suppressor - 1/2x28 The MFI faux KAC-Navy suppressor is designed to thread onto any 1/2x28 barrels and fully enclose the 3-lugs, ensuring an authentic looking fit and finish. Inspired from the coveted KAC MP5N suppressor, this...HKP-22363Now: $117.95Was: $138.95 -
On Sale
HK MP5, 90 Series Holder Plate for Locking Rollers
MKE
Now: $24.95Was: $29.95MKE Roller Retainer Plate for Rollers This item is a common wear item that is great to have on hand as they are one of the top items that break or fail with use and age of the service weapon. Compatible With: HK MP5, 94 HK MP5K, SP89 HKG3, 91,...HKP-22235Now: $24.95Was: $29.95 -
HK416 Ultra Carbine Stock and Adapter - .22LR Pistol
HKP HK Parts / Magpul
$264.95HK 416 .22LR Pistol Magpul UCS Stock with Adapter The HK Parts UCS adapter and stock for the MP5K pairs our proven stock adapter with Magpul's UCS stock for a compact, adjustable configuration. The UCS stock features a reversible hinge for left and right...HKP-22196$264.95 -
On Sale
Picatinny Sight Mount - RMR, Holosun
HKP HK Parts
Now: $77.95Was: $97.95HKP HK MP5/K RMR / Holosun Picatinny Sight Mount The HKP HK MP5/K RMR / Holosun Picatinny sight mount offers a secure, low-profile platform for RMR and Holosun optics. Compatible with any firearm featuring a Picatinny rail. It ensures solid mounting,...HKP-22068Now: $77.95Was: $97.95 -
On Sale
Cartridge Pouch - Universal - Velcro Mount
B&T Brugger & Thomet
Now: $12.95Was: $24.95B&T Cartridge Pouch The B&T Cartridge Pouch is a high-quality, tactical ammunition storage solution designed for professionals and enthusiasts alike. Crafted from rugged, weather-resistant materials, this pouch ensures your cartridges remain...HKP-21884Now: $12.95Was: $24.95 -
On Sale
HK UMP, USC 4 Piece M-LOK Set - Anodized
HKP HK Parts
Now: $99.95Was: $149.95HKP HK UMP/USC 4 Piece M-Lok Set - Anodized Upgrade your UMP and USC with the HK Parts 4-piece M-Lok set, designed to eliminate the hassle of snagging and shredding your knuckles on Picatinny rails. This exceptional set significantly expands the...HKP-21663-MNow: $99.95Was: $149.95 -
On Sale
HK UMP, USC Top Rail - Extended - Optics
HKP HK Parts
Now: $47.95Was: $59.95HKP HK UMP & HK USC Extended Top Rail For Optics Nearly an 1" longer than the standard length top rail for mounting any Picatinny mount optic. Made in the USA from 6061 aluminum and hard coat anodize in a beutiful black finish.HKP-21048Now: $47.95Was: $59.95