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.
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
On Sale
Blast Can - Threaded 1/2x28 - 9mm, 5.56 / .223
MI Midwest Industries
Now: $34.95Was: $38.95MI Blast Can 1/2x28 Thread (5.56/9mm) Specifications: Directs muzzle blast forward on short barrel rifles and pistols. Does not reduce recoil or flash. Constructed from 6061 aluminum, and hardcoat anodized for a lifetime of service 1/2x28 threads...HKP-21535Now: $34.95Was: $38.95 -
Out Of Stock
B&T 1/2x28 Direct Thread to Hub Adapter
B&T Brugger & Thomet
$89.95B&T Direct Thread 1/2x28 Hub Adapter Convert any 1/2x28 RH threaded barrel to accept Hub devices with this direct fit adapter. Compatible With: HK MP5, MP5K, SP5, SP5K HK MR556 HK UMP 9mm B&T APC223, SPC223 B&T APC9K B&T GMH9...HKP-21506$89.95 -
On Sale
HK VP9L Railok™ Threaded Barrel Compensator - BLEMISHED
HKP HK Parts
Now: $94.95Was: $189.95HK Parts Railok™ Mounting System Threaded Barrel Compensator: H&K VP9L COSMETICALLY BLEMISHED PARTS ARE FULLY FUNCTIONAL AND SOLD AS IS. THIS PART IS NOT ELIGIBLE FOR RETURN. ALL BLEMISHED PART SALES ARE FINAL. The HK Parts Railok™...HKP-21263-BNow: $94.95Was: $189.95 -
On Sale
HK416, MR556, G36 A5 Flash Hider - Threaded 1/2x28
HKP HK Parts
Now: $47.95Was: $59.95HKP (5.56/.223) HK 416C A5 Flash Hider - Threaded 1/2x28 Made from ordnance grade steel, heat treated, and melonited (nitride process) for maximum longevity. Machined correctly to reduce tuning fork noise for a more pleasant time at the range. This is...HKP-21342Now: $47.95Was: $59.95 -
On Sale
HK UMP Hammer Spring - Left
USA
Now: $7.95Was: $9.95USA HK UMP Left Hammer Spring New U.S hammer spring- left side A high wear item that needs to be changed when light firing pin strikes develop on your USC or UMP firearm. Compatible With: HK UMP models 45, .40 & 9mm USC .45 and other...HKP-20840Now: $7.95Was: $9.95 -
On Sale
HK VP9, VP40, P30 Replacement Kit - Comp Weight™
HKP HK Parts
Now: $8.95Was: $9.99Comp Weight™ - Replacement Kit - HK VP9, VP40, P30 Replacement Set for the HK Parts VP9, VP9L, VP40, P30 Comp Weight™/compensator. This includes the quick detach lever, side set screw, and bottom lever screw. Perfect for backup and spare...HKP-19458Now: $8.95Was: $9.99 -
On Sale
HK45C, HK45C Tactical Barrel - .45 ACP - 5.6" - Threaded 16x1 LH
RCM
Now: $211.95Was: $250.00RCM HK45C/45C .45 ACP Tactical Barrel - Threaded 16x1 LH US-made HK45C & HK45C Tactical threaded barrel, compatible with a range of flash hiders and sound suppressors. Unlike the factory HK45C Tactical barrel with metric 16x1 LH threads, this...HKP-20131Now: $211.95Was: $250.00 -
On Sale
HK MP5K Pistol Stabilizing Brace - SBA4 - Adapter Included
SB Tactical
Now: $264.95Was: $294.95SB Tactical HK MP5K SBA4 Pistol Stabilizing Brace & Adapter Designed for all platforms capable of accepting a mil-spec carbine receiver extension, the SBA4 is 5-position adjustable and features an integral, ambidextrous QD sling socket...HKP-19930Now: $264.95Was: $294.95 -
On Sale
HK45 Thread Protector - Threaded .578x28 RH
USA
Now: $19.95Was: $24.95HK45 .45 ACP Thread Protector - Threaded .578x28 RH Made in the USA, HK45 .45 ACP thread protector, for full size & compact barrels with a 578x28 RH. Made from stainless steel with a nitride finished. Specifications: Made in the USA Stainless...HKP-19891Now: $19.95Was: $24.95 -
On Sale
OEM Fero Z51 Night Vision Manual
Now: $9.95Was: $24.95OEM Fero Z51 Night Vision Manual This is the manual for the recently imported German night vision scope for the MG3 Machinegun, G3 Rifle and Pazerbusche 84. The condition of these booklets will vary. Specifications: Height: 8.5" Width: 5...HKP-19604Now: $9.95Was: $24.95 -
HK45 Series Recoil Spring
H&K Heckler & Koch
$19.95HK 45 Series Recoil Spring New HK German factory OEM part. Compatible with all new HK45 full-size pistols and not be used for the USP .45 models. A must-have spare part for repair and replacement as this is a high-wear item.HKP-01562$19.95 -
Out Of Stock
HK Mark 23 Tactical Barrel .45 ACP - 5.87" - Threaded 16x1 LH
RCM
$250.00RCM HK Mark 23 .45 ACP Tactical Barrel - Threaded 16x1 LH US-made HK Mark 23 tactical threaded barrel designed for use with a wide variety of flash hiders and sound suppressors. Unlike the factory HK Mark 23 barrel with 16x1 right-hand...HKP-17443$250.00