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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On Sale
HK MP5 Receiver Flat - Smooth Top
HKP HK Parts
Now: $100.76Was: $125.95HKP HK MP5 Receiver Flat - Smooth Top The MP5 receiver flat has been meticulously crafted by the original German tool and die maker of the LSC receiver flat, utilizing factory original German prints and specifications. This receiver boasts a flat top,...Now: $100.76Was: $125.95 -
On Sale
HK MP5, MP5K Rear Sight Base
HKP HK Parts
Now: $15.96Was: $19.95MP5 & MP5K Rear Sight Base- Weldment The only factory-correct sight base with the factory HK German side axis grooves. Compatible With: HK MP5, 94 HK MP5K, SP89 HK MP5 40, MP5 10 MAC-5 clones may require custom fitment. Modified components are...Now: $15.96Was: $19.95 -
On Sale
HK417, MR762 QD End Plate - Flush Cup
H&K Heckler & Koch
Now: $137.66Was: $152.95H&K HK MR762/417 Flush Cup QD End Plate Factory HK flush end cap with dual QD sockets for ambidextrious sling attachment. Compatible With: HK MR762 HK 417Now: $137.66Was: $152.95 -
On Sale
HK G36 Backplate Complete with Recoil Assembly
H&K Heckler & Koch
Now: $179.95Was: $199.95HK G36 Backplate Complete With Recoil Assembly New HK German G36 Backplate with new G36/SL8 recoil buffer and recoil assembly. This assembly does include the recoil rod retaining screw. This is a great spare or replacement to have on hand. These are also...Now: $179.95Was: $199.95 -
On Sale
HK417, MR762, G28 Spring - Ejection Cover Axle
H&K Heckler & Koch
Now: $8.96Was: $9.95H&K HK MR762/417/G28 Ejection Cover Axle Spring New Hk German manufacture for the MR762 & HK 417 firearm. The spring is used on the axle and ejection port cover door to allow it to be closed and spring open. Compatible With: HK MR762 HK 417 HK...Now: $8.96Was: $9.95 -
On Sale
HK MR556, MR223 Upper Receiver w/ F/A & Ejection Door
H&K Heckler & Koch
Now: $625.46Was: $694.95New HK German Partially Pre-Assembled MR556/MR223 Upper Receiver Each unit comes just as shown with the F/A (forward assist) assembly and ejection port door assembly installed from the HK factory. Compatible With: HK MR556 HK MR223 HK...Now: $625.46Was: $694.95 -
On Sale
HK G36, SL8 Cocking Handle
H&K Heckler & Koch
Now: $50.36Was: $55.95HK Cocking Handle For G36 & SL8 Bolt CarriersNow: $50.36Was: $55.95 -
On Sale
HK MR556 A4 Charging Handle - Ambi
H&K Heckler & Koch
Now: $179.95Was: $199.95H&K HK MR556 A4 Ambi Charging Handle Upgrade your MR556 or HK416-style rifle with this factory H&K ambidextrous charging handle, designed for smooth, reliable operation from either side. Built to Heckler & Koch’s exacting standards,...Now: $179.95Was: $199.95 -
On Sale
HK417, MR762 Takedown Pin - Front - A1 Style
H&K Heckler & Koch
Now: $53.96Was: $59.95H&K HK MR762 Lower Receiver Front Takedown Pin - A1 Style This is the front (large) 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...Now: $53.96Was: $59.95 -
On Sale
HK416, MR556 Release Latch - Charging Handle
H&K Heckler & Koch
Now: $35.96Was: $39.95H&K HK MR556/416 Charging Handle Release Latch Perfect replacement item for the MR556 & HK 416 charging handle. New HK German manufacture. These can become chewed up and damaged with a hard drop or with heavy use. This is a great item to keep on...Now: $35.96Was: $39.95 -
HK MP5 40/10 Trunnion
HKP HK Parts
$139.95MP5 40 & MP5 10mm Trunnion Machined from ordnance-grade steel and heat-treated to factory specs. Each has the bullet guides pre-installed and included. These are the best USA-made trunnions on the market. Machined to HK spec, making the installation...$139.95 -
On Sale
HK MP5K, SP89 Flat Receiver - 9mm
HKP HK Parts
Now: $159.96Was: $199.95MP5K, SP89 Receiver Flat - 9mm New MP5K receiver flat made by the original German tool and die maker of the LSC receiver flat utilizing factory original German prints and specifications. The creator of our receiver flat has been regarded as the premier...Now: $159.96Was: $199.95