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.
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
On Sale
HK MP5 1913 End Plate Adapter
MI Midwest Industries
Now: $80.95Was: $89.95MI HK MP5 1913 End Plate Adapter The Midwest Industries Picatinny end plate adapter opens up your stock and brace options to a myriad of off-the-shelf possibilities. The adapter installs in the same manner as the factory end cap with a single push pin...Now: $80.95Was: $89.95 -
On Sale
HK416, MR556 Castle Nut
H&K Heckler & Koch
Now: $29.66Was: $32.95H&K HK MR556/416 Castle Nut For Buffer Tube New HK German manufacture. This buffer tube castle nut will fit both mil-spec and commercial buffer tubes. All steel manufacture. With HK round tool attachment points as well as traditional wrench...Now: $29.66Was: $32.95 -
On Sale
HK MP5F Receiver Flat - Alternate Holes
HKP HK Parts
Now: $100.76Was: $125.95HKP HK MP5F 9mm Flat - Alternate Holes MP5 receiver flat crafted by the original German tool and die maker of the LSC receiver flat using factory original German prints and specifications. This receiver features alternate holes for the correct MP5F or...Now: $100.76Was: $125.95 -
On Sale
DTAC Picatinny Rail For HK Receivers - 15 Slot
DTAC Dakota Tactical
Now: $67.45Was: $74.95Dakota Tactical Picatinny Rail To Weld To The Receiver Mil-Spec all steel picatinny rail in the white, relief cut for HK receivers & made for mounting scopes and optics to HK builds. This unit easily welds to the top of your HK receiver. Compatible...Now: $67.45Was: $74.95 -
On Sale
HK MR556 Incomplete Upper Receiver
H&K Heckler & Koch
Now: $404.95Was: $449.95HK German Stripped HK MR556 Upper Receiver New factory German incomplete and unmarked MR556 upper receiver. Compatible With: HK MR556 HK MR223 HK 416 Do you need a matching lower for your build? STS416 A5 LOWER - Specialized Tactical...Now: $404.95Was: $449.95 -
On Sale
HK33, HK53, HK93 Receiver Flat - Complete Weldment Set
HKP HK Parts
Now: $183.96Was: $229.95HK .223, 556, & 300 BLK Receiver Flat With Complete Weldment Set Combo Each flat and weldment set comes with 223/556/300BLK complete as a builders combo ready to assemble. Compatible With: HK93, HK33, & HK53 Style Builds 300...Now: $183.96Was: $229.95 -
Out Of StockOn Sale
HK Semi Auto Shelf, Hanger Block For Receiver
HKP HK Parts
Now: $11.16Was: $13.95HK Semi Auto Shelf Weldment, Hanger Block Weldment HK Semi Auto Shelf, Hanger Block to HK's factory specifications for c/p trigger housings. Weld on shelf that is the needed receiver block that welds to the rearward portion of the magwell to allow the...Now: $11.16Was: $13.95 -
On Sale
HK21, HK11 Trunnion
RCM
Now: $247.45Was: $274.95RCM HK21 Trunnion When RCM set out to make a replacement trunnion for the venerable HK21, they started the process by putting a factory unit through rigorous destructive metal testing. The end-product: a US-made trunnion blending the proper...Now: $247.45Was: $274.95 -
On Sale
HK416, MR556, MR762 Forward Assist Assembly
H&K Heckler & Koch
Now: $67.45Was: $74.95H&K HK MR556/MR762/416 Forward Assist Assembly H&K Germany factory MR556 & HK416 forward assist assembly complete. Compatible With: HK MR556 HK 416 HK MR762Now: $67.45Was: $74.95 -
On Sale
HK416, MR556 Piston Guide - Threaded - Upper Receiver
H&K Heckler & Koch
Now: $17.95Was: $19.95HK MR556 & 416 Upper Receiver Threaded Piston Guide Compatible With: HK MR556 HK 416 HK M27Now: $17.95Was: $19.95 -
On Sale
HK MP5K, SP5K Rear Push Pin Weldment Set
USA
Now: $13.46Was: $14.95HK MP5K, SP5K Rear Push Pin Weldment Set This weldment set is the 2 pieces needed for the rear of the flat/receiver that holds the stock/brace or end cap in place. CNC machined from weldable steel and the finest weldment available on the market...Now: $13.46Was: $14.95 -
On Sale
HK417, MR762, G28 Castle Nut for Buffer Tube - Extended
H&K Heckler & Koch
Now: $77.36Was: $85.95HK G28 Buffer Tube Castle Nut New HK German G28 castle nut for the HK MR762, HK417 & G28 models. Black in color. This is the proper part for use with the G28 buffer tube and stock upgrades. Compatible With: HK MR762 HK 417 HK G28 DMRNow: $77.36Was: $85.95