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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HK CC9 Magazine Release Button
H&K Heckler & Koch
$19.95H&K CC9 Magazine Release Button Made in Germany, this magazine release button for CC9 pistol allows the user to release the magazine from the frame. Compatible With: HK CC9HKP-22111$19.95 -
HK21E Feed Mechanism - Complete - 7.62 / .308
H&K Heckler & Koch
$22,495.95HK21E Feed Mechanism Complete - German HK - DM1 Links New genuine HK date-coded and marked 21E complete feed mechanism. These are the last of the genuine feed mechs available and due to the HK officially discontinuing the 21E, no additional factory units...HKP-00584$22,495.95 -
HK416, MR556 Charging Handle - E2
H&K Heckler & Koch
$153.95Heckler and Koch E2 Charging Handle for HK416, MR556 Factory HK charging handles for the MR556, HK416 platform. The standard MR556 charging handle allows the release latch to be configured on either the right or left side for user preference. The HK E2...HKP-22021$153.95 -
HK417, MR762 Ejection Port Cover
H&K Heckler & Koch
$42.95H&K HK MR762/417 Ejection Port Cover New HK German polymer .308 style MR762, HK 417 & G28 firearms. Compatible With: HK MR762 HK 417 HK G28 Other HK Spec .308 firearmsHKP-16598-M$42.95 -
HK91, G3 Trunnion - New Old Stock
H&K Heckler & Koch
$79.95Heckler and Koch Trunnion for HK91, G3 - New Old Stock Original Heckler and Koch trunnion for HK91 and G3 rifles. This is a new old stock, original-production component from older HK manufacturing runs and has not been previously installed. Ideal for...HKP-99363$79.95 -
HK416 Upper Receiver Kit - 10.4" - Date Coded - OTB - USED
H&K Heckler & Koch
$3,789.95H&K 416 10.4" Date Coded OTB Upper Parts Kit - USED Genuine HK 416 10.4″ date coded used upper parts kit with a factory German 10.4″ barrel with the new Over The Beach (OTB) features (vented gas block, quad rail forearm). Finish...HKP-22193-M$3,789.95 -
HK416, MR556 Upper Receiver - Stripped - No Forward Assist
H&K Heckler & Koch
$489.99HK416, MR556 Upper Receiver - Stripped - No Forward Assist Genuine HK HK416 upper receiver designed for HK416 and MR556 rifle platforms. This stripped receiver does not include a forward assist or ejection port door. Compatible With HK416, MR556 MR223HKP-22506$489.99 -
HK91, G3 Magazine Release Set - USED
H&K Heckler & Koch
$24.95Heckler and Koch Magazine Release Set (Left to Right) for HK91 and G3 HK-manufactured, used magazine release set for HK .308 pattern rifles. Complete left-to-right mag catch assembly with both push-button and paddle controls. Expect finish wear and...HKP-22466$24.95 -
HK MP5 Case Deflector - 9mm, .40 S&W Receivers
HKP HK Parts
$24.95HKP HK MP5 Case Deflector - 9mm, .40 Receivers US-made steel case deflector for HK MP5 and MP5K receivers in 9mm and .40 S&W. Installs on the ejection-port flat, rivet or weld, to redirect brass and support reliable extraction on MP5 and MP5K style...HKP-22383$24.95 -
HK417, MR762 Enhanced Buffer Tube
H&K Heckler & Koch
$134.95H&K HK MR762/417 Enhanced Buffer Tube/Receiver Extension - Black Brand new factory HK German manufactured MR762, MR308, & HK 417 buffer tube. Compatible With: HK MR762 HK 417HKP-16770$134.95 -
HK FMP G3 Rear Receiver Section - SURPLUS
FMP HK CONTRACT
$24.95H&K G3 Complete Parkerized Rear Receiver Section without Rear Sight - SURPLUS UNIT CONDITION WILL VARY Steel rear receiver section manufactured by FMP on HK tooling. Does not include the rear sight. Compatible with: HK G3, HK91 In-spec...HKP-22375$24.95 -
HK416 E1, MR556 Charging Handle - Incomplete
H&K Heckler & Koch
$109.95HK MR556, HK 416 E1/E2 Charging Handle - Incomplete New HK German manufactured HK MR556, HK 416. A great item to have on hand in the event of breakage or high wear. Compatible With: HK MR556 HK 416 HK M27HKP-17540$109.95