HK416 / MR556 Barrels / Gas Blocks
Upgrade your HK MR556 or HK416 with the ultimate barrel. Choose from genuine HK barrels in various lengths (10.4", 14.5", 16.5"), aftermarket performance options, heavy barrels, and cold hammer forged barrels.
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HK416 A5, MR556 A4 Gas Vent Screw - 1.2mm
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.2mm Gas Vent Screw German 1.2mm gas vent screw for MR556 A4. Provides less venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5$29.95 -
HK416 A5, MR556 A4 Gas Vent Screw - 1.1mm
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.1mm Gas Vent Screw German 1.1mm gas vent screw for MR556 A4. Provides less venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5$29.95 -
HK416 A5, MR556 A4 Gas Vent Screw - 1.0mm
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.0mm Gas Vent Screw German 1.0mm gas vent screw for MR556 A4. Provides less venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5$29.95 -
HK416, MR556 Barrel - 5.56 - 9" - Threaded 1/2"x28 - PDW - A1 and A3
Nefarious Arms
$594.95Nefarious Arms HK 416C 9" Barrel The Nefarious Arms HK416/MR556 Barrel is built for shooters who demand precision, durability, and consistent performance. Made in the USA from 4150 chromoly steel, cold-hammer-forged, and chrome-lined for enduring...$594.95 -
HK MR556 A4 Gas Block- Incomplete
H&K Heckler & Koch
$187.00H&K HK MR556 A4 Gas Block - Incomplete The H&K HK MR556 A4 Gas Block is a high-quality, precision-machined component designed for the MR556 A4 rifle. It houses the gas system that directs gas from the barrel to cycle the action. Compatible...$187.00 -
HK MR556 16" Complete Upper Barrel
H&K Heckler & Koch
$989.95HK MR556 16" Complete Upper Barrel Factory HK MR556 16" barrel, complete with a factory-installed barrel nut, gas block and flash hider. Every component is brand new and meticulously crafted, guaranteeing top-notch quality. This barrel is the ultimate...$989.95 -
Out Of Stock
HK416, MR556 Upper Conversion Kit - Threaded 1/2x28, - 5.56x45 / .223
HKP HK Parts
$699.95H&K MR556 & HK416 (5.56x45/.223) Upper Conversion Kit - Threaded 1/2x28 Finally an answer for all of those that have been wanting a 14.5" upper for an HK416 or MR556. This conversion kit adds an upper or a barrel option for your MR556, CR556...$699.95 -
Out Of Stock
HK416, MR556 Upper 9" 416C Style Conversion Kit
HKP HK Parts
$899.95MR556 & HK416 Upper Conversion Kit - 9" - HK 416C Style Finally an answer for all of those that have been wanting as close to the original, rare unicorn of a find HK 416C 9" barrel conversion kit for 416 or MR556. Each conversion kit upper or barrel...$899.95 -
Out Of Stock
HK416, MR556 9" HK416C Style Barrel Conversion Kit
HKP HK Parts
$0.00MR556 & HK416 Barrel Conversion Kit - 9" - HK 416C Style Finally an answer for all of those that have been wanting as close to the original, rare unicorn of a find HK 416C 9" barrel conversion kit for 416 or MR556. Each conversion kit upper or barrel...$0.00