Receivers / Flats / Uppers
Explore our premier selection of HK receivers, flats, and uppers at HKParts, perfect for building or upgrading your Heckler & Koch firearms. Our products feature precision-engineered MP5 receiver flats, HK 416 complete upper assemblies, and a wide range of custom options designed for tactical and precision shooting. Whether you are customizing an MP5, upgrading an HK416, or constructing a new firearm, our high-quality components provide unparalleled reliability and performance.
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HKP SP5K 9mm Drop In Paddle Mag Release Upgrade Kit
HKP HK Parts
$74.95HK SP5K Anti-Rattle Roller Tipped "Paddle" Magazine Release Install Kit No modifications, no refinishing...complete drop-in kit included. New USA made busing for a drop-in install kit for the HK SP5K. This kit will allow any end-user to quickly,...$74.95 -
HK 90 Series Paddle Mag Release Easy Install Fixture
HKP HK Parts
$187.95HKP 90 Series Paddle Mag Release Easy Install Fixture The original one and only paddle mag release fixture. The perfect jig for the installation of the factory correct paddle mag release with the proper hole placement and an easy to use jig that will...$187.95 -
Out Of Stock
HK Barrel Retaining Pin - 5.15mm
H&K Heckler & Koch
$14.95H&K Barrel Retaining Pin - 5.15mm This is the barrel pin used for installing a new or replacement barrel. HK suggests using a new factory barrel pin when installing or reinstalling an HK barrel in the trunnion. Each pin is slightly oversized for...$14.95 -
HK416, HK417, MR556, MR762 Rear Lower Receiver Locking Pin
H&K Heckler & Koch
$79.95H&K HK MR556/MR762/416/417 Rear Lower Receiver Locking Pin This is the rear takedown pin with ball detent and locking mechanism installed. The idea behind this type of system is to decrease the movement of the upper and lower receivers and improve...$79.95 -
Out Of Stock
RCM HK91, G3, PTR Trunnion
RCM
$64.95RCM Trunnion For The HK91/G3 Series - US Made This part is machined from ordnance grade 9310 enhanced steel and heat treated to exact HK specifications. This item is the best USA-made trunnion on the market. Machined to spec and are to the custom ground...$64.95 -
On Sale
HK MP5 Hat - Snapback - Flat Brim - OSFM
HKP HK Parts
Now: $17.95Was: $22.99HKP MP5 Flat Brim Snapback Hat - OSFM Get your hands on some of our premium hats! Features: Official HKP merchandise 5" wide HKP logo Cotton twill Mesh back panels Plastic adjustable snap closure Size: OSFM Six-panelNow: $17.95Was: $22.99 -
HK MP5, HK94 Case Deflector Rivet
H&K Heckler & Koch
$9.95H&K MP5, HK94 Case Deflector Rivet Each case deflector, US or German-made, will require two rivets to attach the case deflector to the receiver or flat. If you want the factory look and feel of doing it right, these rivets are a must-have. These are...$9.95 -
Lazy Wolf VP Series F2 Flat Face Trigger - Red Tab
Lazy Wolf
$134.95Lazy Wolf VP Series F2 Flat Face Trigger - Red Tab In a collaboration with Lazy Wolf Guns, HK Parts is offering the finest aftermarket triggers for your HK VP9 & VP40 handguns. The drop in VP9 series trigger is the best trigger ever developed after...$134.95 -
HK416A5 Factory German Extended Castle Nut
H&K Heckler & Koch
$75.95H&K HK416 A5 Factory German Extended Castle Nut Original HK Factory German steel 416 A5 Extended Castle Nut. Perfect for MR556, HK 416 A5 builds, or upgrades.$75.95 -
HK MR556 Receiver Take Down Tool
H&K Heckler & Koch
$19.95H&K HK MR556 Receiver Take Down Tool This part is the tool used to tighten down the stock movement on the E1/E2 stock. Each tool will be stored in the rear of the E1/E2 stock. Compatible With: HK MR556 Please Note: We get...$19.95 -
HK416, HK417, MR556, MR762 Detent Takedown Pin
H&K Heckler & Koch
$9.95H&K HK MR556/MR762/416/417 Detent Takedown Pin Compatible With: HK MR556 HK 416 HK MR762 HK 417$9.95 -
HK G36/SL8 (5.56/.223) Factory Recoil Buffer
USA
$16.95HK G36 Or SL8 Factory Recoil Buffer A must have spare part as the buffer is prone to wear and breakage. Compatible With: All HK G36 models SL8 models Clones$16.95