HK416 / MR556 Receivers / Uppers
Upgrade the core of your HK MR556 or HK416. Choose from genuine HK receivers, complete upper receiver groups, and stripped uppers for custom builds.
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Out Of Stock
HK416 Upper Receiver Kit - 11.5" - 5.56
HKP HK Parts
$2,485.95HKP HK 416 11.5" 5.56 Complete Upper Kit Complete This top-tier assembly seamlessly fits onto your mil-spec lower or an STS 416 lower, providing the perfect solution for those seeking an 11.5" 416 style upper without breaking the bank. Each unit is...$2,485.95 -
Out Of Stock
HK416 Upper Receiver Kit - 10.4" - 5.56
HKP HK Parts
$2,485.95HKP 416 10.4" 5.56 Complete Upper Kit Complete Each kit includes the complete upper assembly, bolt group, tungsten buffer, & high-reliability SS recoil spring. This upper kit is a complete gas piston HK 416 style upper assembly that will drop on your...$2,485.95 -
HK MR556 A4 Upper Receiver Kit - 11"- M-LOK
H&K Heckler & Koch
$1,998.95H&K Heckler & Koch MR556 Upper Receiver Kit A4 -11″ - M-LOK This kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 5.56mm AR-style rifles to be retrofitted to HK’s piston and pusher rod system. This...$1,998.95