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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HK MP5, HK91, G3, HK33, HK53, HK93 A3 Buttstock Locking Lever with Spring
H&K Heckler & Koch
$199.95HK MP5, HK91, G3, HK33/53/93 A3 Retractable Stock Locking Lever With Locking Spring Compatible With: MP5 (NOT compatible with MP5 .22 LR) HK G3, HK91 HK33, HK53, HK93HKP-02560$199.95 -
On Sale
HK91, G3 Buffer System - Enhanced
HKP HK Parts
Now: $77.95Was: $97.95HKP Enhanced Buffer System for HK91 and G3 HKP enhanced buffer system for HK91 and G3 pattern rifles. Built with a new steel buffer body, new buffer plunger, and a parkerized finish like factory units. This assembly is designed as an improved...HKP-22866Now: $77.95Was: $97.95 -
On Sale
HK MP5 Extractor Rebuild Kit - 9mm - RCM E Bolt Head
RCM
Now: $54.95Was: $64.95RCM Complete Extractor Rebuild Kit for MP5 E Bolt Heads - 9mm Complete extractor rebuild kit for RCM MP5 E bolt heads in 9mm. Made in the USA from steel, this kit is designed to refresh extractor-related wear components on compatible bolt heads and...HKP-22833Now: $54.95Was: $64.95 -
Out Of Stock
HK MR556 A4 Handguard - RAL8000
H&K Heckler & Koch
$279.95Heckler and Koch MR556 A4 Handguard - RAL8000 This 10" factory H&K MR556 A4 handguard offers a lightweight, free-floating design that enhances accuracy and provides rock-solid mounting for accessories. Made from high-strength aluminum, it features a...HKP-99491$279.95 -
On Sale
FSA Cheek Riser for Strike Folding Stock and Brace
Strike Industries
Now: $26.95Was: $29.95Strike Industries FSA Cheek Riser for Single or Dual Folding Stocks and Braces Adds an adjustable cheek rest for improved comfort and a more consistent cheek weld on Strick Industries single and dual folding stocks, stabilizers, and braces...HKP-22783Now: $26.95Was: $29.95 -
On Sale
HK VP9 OR Optic Mount - RMR
XS Sights
Now: $61.95Was: $72.95XS Sights RMR Optic Mount for HK VP9 Optics Ready Pistols XS Sights RMR optic mount for HK VP9 optics-ready pistols. Machined from steel and finished in BlackNitride, this plate is built to provide a secure mounting surface for RMR footprint optics with...HKP-22676Now: $61.95Was: $72.95 -
On Sale
AR-15 C.A.R.L. 6-Round Limiter Lever for FRTs
ST Inc
Now: $122.95Was: $145.00ST Inc. 6-Round C.A.R.L. Lever for AR-15 Rifles Equipped with AS Designs ARC-Fire and Atrius Trigger Systems The C.A.R.L. (Cam Activated Reset Limiter) is a drop-in FRT-piggy-back system that extends trigger release after every second round fired...HKP-22564Now: $122.95Was: $145.00 -
On Sale
HK G36, G36K, G36C Sling - USED
H&K Heckler & Koch
Now: $46.95Was: $64.95HK G36, G36K, G36C Sling - USED USED PARTS ARE SOLD AS IS. THIS PART IS NOT ELIGIBLE FOR RETURN. ALL USED PART SALES ARE FINAL. 38 mm wide Compatible With: G36 G36K G36CHKP-18459-USEDNow: $46.95Was: $64.95 -
On Sale
HK21 FMP Ultimate Build Kit- Matching Numbers - Complete RCM Barrel
FMP HK CONTRACT
Now: $3,373.95Was: $3,748.95HK21 Complete Build Kit- Matching Numbers HK Parts brings you another exhaustive parts kit. Our numbers-matching Ultimate HK21 parts kit includes everything you need to resurrect an iconic classic and hit the range for belt-fed action. Kit includes...HKP-22539Now: $3,373.95Was: $3,748.95 -
On Sale
HK21, HK11 Barrel with Grip Handle and Flash Hider - 17.7"
RCM
Now: $871.95Was: $1,089.95HK21, HK11 Barrel with Grip Handle and Flash Hider - 17.7" RCM HK21 barrels are crafted from 41V50 CHF blanks and fully nitrided for optimal corrosion resistance. Each barrel ships complete with a new factory flash hider and fully assembled handle...HKP-22533Now: $871.95Was: $1,089.95 -
On Sale
HK G36, UMP Handuard Handstop
OMEGA
Now: $23.95Was: $29.95HK UMP and G36 Handstop HK G36 hand stop kit. Complete with locking block and screw. Fits any G36 handguard without the need of rail segment. Compatible With: All G36 Models HK SL8 HK UMP HK USCHKP-22512Now: $23.95Was: $29.95 -
On Sale
HK90 Series Cocking Tube End Cap - Aluminum - USED
HKP HK Parts
Now: $7.95Was: $12.95HK Cocking Tube End Cap - Aluminum - USED USED PARTS ARE SOLD AS IS. THIS PART IS NOT ELIGIBLE FOR RETURN. ALL USED PART SALES ARE FINAL. Made from weight-saving aircraft-grade aluminum alloy. US-made. Compatible With: All 90 series HK firearms and...HKP-02806-USEDNow: $7.95Was: $12.95