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
HK417, MR762, G28 E1 Charging Handle - Extended - Ambidextrous
H&K Heckler & Koch
Now: $188.95Was: $209.95H&K HK MR762/417/G28 E1 Extended Ambidextrous Charging Handle HK German MR762/HK 417 extended charging handle. The unique release latch can be swapped from left to right sides to make each setup ambi friendly and modular. HK's own design boasts an...Now: $188.95Was: $209.95 -
On Sale
HK MP5, MP5K Scope Tab - Billeted - Weldment
HKP HK Parts
Now: $7.96Was: $9.95HKP HK MP5/K Billeted Scope Tab - Weldment Billeted scope tab weldment for HK MP5, MP5K, and compatible clones. Provides a correct mounting point for optics. Compatible With: HK MP5/94 HK MP5K/SP89 HK MP5 40/10 Clones or custom buildsNow: $7.96Was: $9.95 -
On Sale
Now: $13.46Was: $14.95 -
Out Of StockOn Sale
HK417, MR762 Upper Receiver Rod Tool
MI Midwest Industries
Now: $143.95Was: $159.95Midwest Industries Upper Receiver Rod Tool for HK417, MR762 Receiver support rod for HK417 and MR762 upper receivers. Designed to prevent receiver and index-pin damage during barrel nut removal, muzzle device installation, and other high-torque...Now: $143.95Was: $159.95 -
Out Of StockOn Sale
HK21 T-Rail Set - Factory Style
Michaels Machines
Now: $247.50Was: $275.00Michael's Machines HK 21 (7.62x51/.308) Factory Style T-Rail Set HK21 US-made rails for all HK21 builds. This is similar to the rails above, only prepped/cut for the HK21 feed mechanism.Now: $247.50Was: $275.00 -
On Sale
HK MR762 Ejection Door Clamping Sleeve
H&K Heckler & Koch
Now: $4.46Was: $4.95H&K HK MR762 Ejection Door Clamping Sleeve Compatible With: HK MR762Now: $4.46Was: $4.95 -
On Sale
HK MP5K Trunnion - Gunsmith Special
USA
Now: $18.71Was: $54.95HK MP5K 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: $18.71Was: $54.95 -
On Sale
HK416, MR556 - Takedown Pin - Front - A4 Style
H&K Heckler & Koch
Now: $24.25Was: $26.95H&K HK416, MR556 A4 Front Takedown Pin The HK416 front takedown pin is a German-made component designed to securely fasten the upper and lower receivers. Precision-machined for a proper fit, it ensures reliable function and serves as an ideal...Now: $24.25Was: $26.95 -
Out Of StockOn Sale
HK G36, SL8 Roll Pin - Gas Piston
H&K Heckler & Koch
Now: $8.96Was: $9.95H&K HK G36, HK SL8 Roll Pin for Gas PistonNow: $8.96Was: $9.95 -
On Sale
HK G36, SL8 Cocking Handle
HKP HK Parts
Now: $39.96Was: $49.95Cocking Handle For G36 & SL8 Bolt Carriers - USA New USA made charging handle ideal for a 922 replacement part. Made in the USA.Now: $39.96Was: $49.95 -
On Sale
MM HK PSG1/21E/23E Forward Complete Assist Assembly
Michaels Machines
Now: $701.96Was: $779.95MM HK PSG1/21E/23E Forward Complete Assist Assembly Michael's Machines US-made complete forward assembly or your HK PSG1, MSG90, HK21E/23E. A great option for a build now that the factory units are no longer available. Available exclusively...Now: $701.96Was: $779.95 -
On Sale
HK MP5K Receiver Flat - 10mm / .40 S&W -
HKP HK Parts
Now: $159.96Was: $199.95MP5K-40, MP5K-10 Receiver Flat - USA Receiver Flat for use with a MP5K-40 or MP5K-10mm build. Please note: This is for the flat as picture no weldments are included. ***This US made receiver flat counts as one required 922r compliant part***Now: $159.96Was: $199.95