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 G36, SL8 Pin - Axle - Cocking Handle - US
Now: $9.86Was: $10.95HK G36, SL8 Cocking Handle Axle Pin - US Made This is the rivet pin that is used to attach the swiveling cocking handle to the body of the carrier. These can be replaced as they break and wear. Compatible With: HK G36 models HK SL8 modelsNow: $9.86Was: $10.95 -
On Sale
HK MP5K, SP89, SP5K 9mm RS Trunnion
RCM
Now: $62.96Was: $69.95MP5K Reverse Stretch Trunnion US-made to exact factory HK specifications for the HK MP5K, SP89 9mm builds. There is a difference between the MP5K and the MP5 trunnion. This offering is the correct trunnion for the MP5K and all MP5K PDW variants,...Now: $62.96Was: $69.95 -
Out Of Stock
HK MP5, MP5K Case Deflector
H&K Heckler & Koch
$0.00HK German case deflector for receiver flat or receiver for all MP5, HK94, MP5K & SP89 builds. The case deflector is riveted or welded in place on the ejection port of the 9mm receiver/flat to aid in the extraction of the 9mm round. HK MP5, 94 HK...$0.00 -
Out Of StockOn Sale
HK416 Upper Receiver Kit - 10.4" - 5.56
HKP HK Parts
Now: $1,988.76Was: $2,485.95HKP 416 10.4" 5.56 Complete Upper Kit Complete Each kit includes the complete upper assembly, bolt group, tungsten buffer, & high-reliability SS recoil spring. This upper kit is a complete gas piston HK 416 style upper assembly that will drop on your...Now: $1,988.76Was: $2,485.95 -
On Sale
HK End Cap - Detent - Cocking Tube
H&K Heckler & Koch
Now: $4.46Was: $4.95HK German Cocking Tube End Cap/Dust Cap Detent HK German cocking tube detent for all steel and aluminum cocking tube end caps. Made of steel and finished in black.Now: $4.46Was: $4.95 -
On Sale
HK 416, MR556 Roll Pin - Charging Handle
H&K Heckler & Koch
Now: $7.16Was: $7.95HK Clamping Sleeve or Roll Pin for Pawl On Charging Handle This is the longer one that is used on the outside of the charging handle. There are one of these pins used per charging handle.Now: $7.16Was: $7.95 -
On Sale
HK G36, SL8 Complete Recoil Rod Assembly
H&K Heckler & Koch
Now: $62.96Was: $69.95Recoil Rod Assembly for HK G36 & SL8 New HK factory German G36/SL8 (fits all variants of SL8/G36) recoil rod assembly complete. Great for replacement or for a spare as these have been hard to find.Now: $62.96Was: $69.95 -
On Sale
HK MP5 Lower Receiver - Section
H&K Heckler & Koch
Now: $49.46Was: $54.95HK MP5 Rear Receiver Section HK German demilled receiver section with rear sight base as installed at the factory. The rear push pin section is still attached to the demilled receiver section.Now: $49.46Was: $54.95 -
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