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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$95.95 -
HK MP5, MP5K, MKE AP5, AP5-P Case Deflector - 9mm Receivers
MKE
$24.95MKE AP5, AP5-P, HK MP5, MP5K Case Deflector for 9mm Receivers This steel case deflector is manufactured by MKE for AP5 firearms and fits MP5-pattern 9mm receivers. It installs on the ejection-port...HKP-99349$24.95 -
HK23E, HK21E Rear Sight Base
H&K Heckler & Koch
$193.95Heckler and Koch Rear Sight Base HK21E and HK23E Genuine HK German rear site base. ReqHKP-21508$193.95 -
HK MR556, MR223 A5 Incomplete Upper Receiver
H&K Heckler & Koch
$489.95HK German Un-Assembled/Stripped HK MR556/MR223 A5 Upper Receiver Factory HK MR556 A5 upper receiver. This is the semi-auto MR556 variant. Compatible With: HK MR556HKP-18785$489.95 -
HK416 E1, MR556 Charging Handle - Incomplete
H&K Heckler & Koch
$109.95HK MR556, HK 416 E1/E2 Charging Handle - Incomplete New HK German manufactured HK MR556, HK 416. A great item to have on hand in the event of breakage or high wear. Compatible With: HK MR556<HKP-17540$109.95 -
HK MR762 A4 Upper Receiver Kit - 16"
H&K Heckler & Koch
$2,449.95HK UPPER RECEIVER KIT MR762 A4 - 16" The MR762 A4 upper kit contains a complete upper receiver and barrel assembly. The closed system design significantly reduces malfunctions typically associated...HKP-22424$2,449.95 -
HK91, G3, HK33, HK53, HK93 Paddle Magazine Release - Anti-Rattle - USED
H&K Heckler & Koch
$42.95Heckler and Koch Anti Rattle Paddle Magazine Release for HK91, HK G3s and HK33, HK53, HK93 - USED This is a used German anti-rattle paddle mag release for installation on all Heckler and Koch...HKP-22061$42.95 -
On Sale
HK G3 - FMP Early Type Demilled Front End
FMP HK CONTRACT
Now: $63.72Was: $99.95HK G3 - FMP Early Type Demilled Front End Early style G3 front end with no hanger. These are the perfect option for those doing custom builds. Good condition over all. Includes: Cocking tube<HKP-20845Now: $63.72Was: $99.95 -
Tommy Built UMP Buffer Tube Adapter
$249.95Tommy Built UMP Buffer Tube Adapter UMP hinge with Buffer Tube Mount for adapting an AR style Mil spec brace or stock. Constructed of nylon and has 6 adjustable positions. Adapter only- stocks in the...HKP-19967$249.95 -
Out Of Stock
HK91, G3, PSG1, MSG90 T-Rail Reinforcement Set for Receiver
Michaels Machines
$299.95HK Receiver Reinforcement T-Rail Set For Left and Right Sides T-rails are used to strengthen HK receivers or for custom builds. These are the finest T-rails available on the market. Made from...HKP-00236$299.95 -
Out Of Stock
HK MP5, HK94 Trunnion - 9mm - USA
HKP HK Parts
$54.95HKP MP5, 94 Trunnion 9mm - USA US made to exact factory HK specifications for the HK MP5, 94 type builds. Machined completely from ordnance grade steel and heat treated to factory specs. These are...HKP-17934$54.95 -
HK MP5, AP5 Trunnion - 9mm
MKE
$64.95HK MP5 Trunnion Made to exact factory HK specifications for the HK MP5K type builds. Machined to HK spec making the install painless and hassle free. Compatible With: MP5HKP-22523$64.95