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
-
Out Of Stock
HK G36, SL8 Roll Pin - Gas Piston
H&K Heckler & Koch
$9.95H&K HK G36, HK SL8 Roll Pin for Gas PistonHKP-16386$9.95 -
HK417, MR762 Charging Handle Catch
H&K Heckler & Koch
$59.95HK MR762, HK417 Extended Charging Handle Catch Complete New HK German manufacture. A great part to have on hand as these are prone to breakage and wear. Compatible With: HK MR762 HK 417 HK G28HKP-16852$59.95 -
On Sale
AR-15 Commercial Buffer Tube Kit
HKP HK Parts
Now: $27.95Was: $47.95AR-15 Commercial Buffer Tube Kit Compatible With: All AR-15 style platforms Not correct length for HK rifles Includes: Made with T7 7075 aircraft-grade aluminum Made in the USA with a polished inside tube Mil-Spec triple hard coat...HKP-02736Now: $27.95Was: $47.95 -
On Sale
HK MP5, HK94 Rivet for Sling clip - Pack of 3
LSC
Now: $2.95Was: $3.95LSC HK MP5, HK94 Rivet for Sling Clip and Case Deflector - Pack of 3 Each sling clip, US or German-made, will require 3 rivets to attach to the receiver or flat. Compatible With: All MP5 and MPK models and variations in all calibers THIS CLOSEOUT...HKP-99400Now: $2.95Was: $3.95 -
On Sale
HK FMP G3 Rear Receiver Section - SURPLUS
FMP HK CONTRACT
Now: $19.95Was: $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-22375Now: $19.95Was: $24.95 -
HK416 A5 Stripped Upper Receiver - RAL8000
H&K Heckler & Koch
$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...HKP-18787$1,559.95 -
HK CC9 Magazine Spring - 12 Round
H&K Heckler & Koch
$9.95Heckler and Koch 12-Round Magazine Spring for HK CC9 Genuine 12-round HK CC9 steel magazine spring. Compatible With: HK CC9HKP-22509$9.95 -
HK MR762 A4 Charging Handle
H&K Heckler & Koch
$199.95H&K MR762 A4 Charging Handle Upgrade your MR762 or HK417 style rifle with this factory H&K ambidextrous charging handle, engineered for smooth, reliable operation from either side. Built to Heckler & Koch’s exacting standards, this...HKP-21967$199.95 -
HK417, MR762A4 Magazine Catch
H&K Heckler & Koch
$99.95Heckler and Koch Magazine Catch for HK417 and HK MR762 German-made magazine catch for HK MR762 A4 and HK417. Compatible With: HK417, MR762 A1, MR762 A4HKP-21961$99.95 -
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 -
Out Of Stock
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