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 G3 Rear Receiver Section with Rear Sight - Complete - Parkerized - SURPLUS
H&K Heckler & Koch
Now: $49.46Was: $54.95H&K G3 Complete Parkerized Rear Receiver Section w/ Rear Sight - SURPLUS UNIT QUALITY MAY VARY - SEE PHOTOS FOR EXAMPLE OF CONDITION RANGE Genuine H&K parkerized steel rear receiver section with fully installed G3 rear sight assembly, two stock...Now: $49.46Was: $54.95 -
On Sale
HK417, MR762 Cylindrical Pin for Stop Pin
H&K Heckler & Koch
Now: $8.96Was: $9.95H&K HK MR762/417 Cylindrical Pin For Stop Pin HK 2x18 mm pin designed for use with the rear take down pin detent and spring. Compatible With: HK MR762 HK 417Now: $8.96Was: $9.95 -
On Sale
HK MR762 A4 Upper Receiver Kit - 13"
H&K Heckler & Koch
Now: $2,249.95Was: $2,499.95HK MR762 A4 Upper Receiver Kit - 13" The MR762 A4 kit contains a complete upper receiver and barrel assembly. The closed system design significantly reduces malfunctions typically associated with direct-impingement gas systems, as hot carbon fouling and...Now: $2,249.95Was: $2,499.95 -
On Sale
HK417, MR762 Takedown Pin - Front - A4 Style
H&K Heckler & Koch
Now: $36.86Was: $40.95H&K MR762 A4 Receiver Front Takedown Pin German-made factory pivot pin for the MR762 A4. Will work with A1 models as well. Compatible With: HK MR762 A1 and A4 HK417Now: $36.86Was: $40.95 -
On Sale
HK G36 Bushing - Cocking Handle
H&K Heckler & Koch
Now: $8.96Was: $9.95HK German G36 Cocking Handle BushingNow: $8.96Was: $9.95 -
On Sale
HK416 A5 Stripped Upper Receiver - RAL8000
H&K Heckler & Koch
Now: $1,403.96Was: $1,559.95HK German Un-Assembled - Stripped HK416 A5 Upper Receiver - RAL 8K Brand new factory German RAL 8000 HK416A5 upper receiver. Compatible With: HK416 HK MR556 HK MR223 Looking for a matching lower for your build? STS416 A5 LOWER - Specialized...Now: $1,403.96Was: $1,559.95 -
On Sale
HK Receiver Flat Bending Set Jig - RENTAL
HKP HK Parts
Now: $79.96Was: $99.95Flat Bending Jig Set For All HK Style Receiver Flats - RENTAL Receiver flat bending jig RENTAL for all HK receiver flats. Our rental jigs are crafted in the US from billeted steel and include the latest revisions with proper dowel spacing for the...Now: $79.96Was: $99.95 -
On Sale
HK MP5 Trunnion - Gunsmith Special
USA
Now: $24.95Was: $54.95HK MP5 Trunnion - Gunsmith Special US made HK MP5 trunnions sold as-is. Will require work before being functional. We recommend the work be performed by a professional gunsmith. The condition will vary from part-to-part vs. the pictured unit. Compatible...Now: $24.95Was: $54.95 -
Out Of StockOn Sale
HK416 Upper Receiver
HKP HK Parts
Now: $391.96Was: $489.95US Made Complete HK 416, MR556 Style Upper Receiver New US made HK416/MR556 style upper receiver. Includes: Upper receiver Forward assist assembly Ejection port door assembly Piston guide Compatible With: HK MR556 HK MR223 HK 416 Need a...Now: $391.96Was: $489.95 -
HK416, MR556, AR-15 Commercial Buffer Tube Kit
HKP HK Parts
$47.95AR-15 Commercial Buffer Tube Kit Compatible With: HK MR556 & 416 All AR-15 style platforms Includes: Made with T7 7075 aircraft-grade aluminum Made in the USA with a polished inside tube Mil-Spec triple hard coat Teflon anodized...$47.95 -
On Sale
HK416 Commercial OTB Buffer Tube HK E1 Stock Combo
H&K Heckler & Koch
Now: $422.95Was: $469.95HK 416 OTB E1 Stock & Buffer Tube Combo - Commercial Genuine HK 416 E1 commercial stock with the new style marine environment "over the beach" buffer tube. Buffer tube has ball bearing rollers to tighten the stock when locked in position, and helps...Now: $422.95Was: $469.95 -
On Sale
HK416, MR556 Receiver End Plate - BLEMISHED
H&K Heckler & Koch
Now: $11.21Was: $24.95H&K HK MR556/416 Receiver End Plate - BLEMISHED INSTALLATION MARKS. COSMETICALLY BLEMISHED PARTS ARE FULLY FUNCTIONAL AND SOLD AS IS. THIS PART IS NOT ELIGIBLE FOR RETURN. ALL BLEMISHED PART SALES ARE FINAL. New HK German manufacture. Compatible...Now: $11.21Was: $24.95