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 MP5, HK33, HK93 Stock or Brace Adapter - ACE Style
HKP HK Parts
Now: $79.95Was: $99.95ACE Adapter for HK MP5 and HK 93 Each ACE adapter is made from a solid billet of CNC machined aircraft grade aluminum. Properly buffered with factory correct "H" buffers to protect your expensive firearm. This is the finest ACE adapter available period...HKP-18504Now: $79.95Was: $99.95 -
On Sale
HKP Front Sight Blade - BLEMISHED
HKP HK Parts
Now: $2.95Was: $3.95HKP Front Sight Blade - BLEMISHED COSMETICALLY BLEMISHED PARTS ARE FULLY FUNCTIONAL AND SOLD AS IS. THIS PART IS NOT ELIGIBLE FOR RETURN. ALL BLEMISHED PART SALES ARE FINAL. US manufactured HK front sight blade. New US made. Compatible With: All HK...HKP-17551-BNow: $2.95Was: $3.95 -
On Sale
HK MP5 Trigger Group - Super Safety - Push Pin
War Hammer Armaments
$499.95 - $539.95War Hammer Armaments OEM Polymer MP5 Super Safety Lower Receiver - Push Pin War Hammer Super Safety complete lower for MP5 push pin platforms. Constructed of Kevlar and carbon-fiber–infused polymer, this complete lower is engineered for...HKP-22824-M$499.95 - $539.95 -
On Sale
HK91, G3, HK93, HK53 Extractor Spring - Used
H&K Heckler & Koch
Now: $3.74Was: $6.74Heckler and Koch German Used Extractor Spring for HK91, G3, HK93, HK53 Factory HK German used extractor spring for HK91, G3, HK93, and HK53 pattern firearms. The extractor spring is one of the most frequently replaced parts on HK firearms and is a...HKP-00188-USEDNow: $3.74Was: $6.74 -
On Sale
HK MP5KSD Barrel - 9mm - 4.89″- Threaded 18x1
RCM
Now: $147.95Was: $174.95HK MP5KSD Barrel - 9mm - 4.89″- Threaded 18x1 The RCM HK Style MP5 SD-K Barrel measures 4.890 inches in length and is constructed from 41v50 cold hammer-forged steel. It features a salt bath nitride finish throughout. This barrel is designed based...HKP-22493Now: $147.95Was: $174.95 -
On Sale
HK G3 ButtPlate with Catch Spring - Standard Stock - Green - Used - BLEMISHED
H&K Heckler & Koch
Now: $0.97Was: $2.95HK G3 Standard Stock Buttpad - Green - Used - BLEMISHED SOLD INDIVIDUALLY - CRACKED USED PARTS ARE SOLD AS IS. THIS PART IS NOT ELIGIBLE FOR RETURN. ALL BLEMISHED PART SALES ARE FINAL. This German-made buttpad is an excellent replacement for your...HKP-21865-ODG-BNow: $0.97Was: $2.95 -
HK MR556 A4 Hammer - Incomplete - Semi-Auto
H&K Heckler & Koch
$43.95Heckler and Koch Hammer for HK MR556 Semi-Auto rifles Factory-original German steel hammer for MR556 A4 rifles. Designed as a direct replacement for worn or damaged hammers in MR556 A1 and A4 trigger assemblies. Compatible With: MR556A1 MR556...HKP-22384$43.95 -
On Sale
HK MP5K End Cap with Swivel Attachment
MKE
Now: $58.95Was: $69.95MKE End Cap with Swivel Attachment for HK MP5K Durable factory-style end cap designed for MP5K platforms. Provides a secure sling mounting point for MP5K pistols. Compatible With: MP5K SP89 SP5K (may require some fitting, install lower pin...HKP-22373Now: $58.95Was: $69.95 -
On Sale
HK416, MR556 Handguard - 12.5" - M-LOK
H&K Heckler & Koch
Now: $170.95Was: $189.95H&K HK MR556/HK416 12.5" M-LOK Compatible Handguard Manufactured by HK from aircraft grade aluminum, this M-LOK handguard is designed for the Heckler & Koch MR556 & HK 416 rifles. This handguard showcases a 12.5" length and includes a...HKP-99321Now: $170.95Was: $189.95 -
On Sale
HK416, MR556 - Recoil - Buffer - Tungsten - USED
H&K Heckler & Koch
Now: $64.95Was: $89.95HK416, MR556 - Recoil - Buffer - Tungsten - USED VARYING CONDITION SHOWN - SOLD INDIVIDUALLY USED PARTS ARE SOLD AS IS. THIS PART IS NOT ELIGIBLE FOR RETURN. ALL USED PART SALES ARE FINAL. The proprietary tungsten HK-manufactured buffer is one of the...HKP-00041-USEDNow: $64.95Was: $89.95 -
On Sale
HK416, MR556 Barrel Flute Cleaning Brush - 5.56 / .223
HKP HK Parts
Now: $19.95Was: $24.95HK MR556, HK416 Cleaning Brush - Barrel Flute - 5.56 / .223 This brush is a must-have for cleaning the chamber flutes on a MR556 or HK416 firearm. If the flutes become clogged or dirty, the firearm will cease to extract properly. An HK fluted barrel...HKP-22316Now: $19.95Was: $24.95 -
On Sale
HK Rifle Buttpad for Wooden Stocks - Used
HKP HK Parts
Now: $12.95Was: $16.95Heckler and Koch Buttpad for Wooden Stocks - Enhanced Polymer Buttpad - Used Used and in varying condition. See photos for examples. The enhanced polymer buttpad is a direct replacement for the standard fixed stock buttpad and can be swapped out in...HKP-22211Now: $12.95Was: $16.95