HK416 / MR556 Barrels

H&K MR556 A4/416 A5 2.3mm Gas Vent Screw German 2.3mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5

H&K MR556 A4/416 A5 2.2mm Gas Vent Screw German 2.2mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5

H&K MR556 Slimline Barrel, 16.5" Genuine HK MR556 Slimline 16.5" Barrel.  Non-chrome-lined for match accuracy. Compatible With: HK MR556

H&K HK MR556 A4/A5 11" Barrel This 11" factory H&K MR556 A4 barrel is built for compact performance without compromising durability or accuracy. Cold hammer-forged, it’s made to Heckler & Koch’s stringent standards and is ideal...

H&K MR556 A4/416 A5 1.4mm Gas Vent Screw German 1.4mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4

H&K HK MR556 A4/A5 16.5" Barrel This 16.5" factory H&K MR556 A4 barrel is cold hammer-forged from high-quality steel for exceptional durability, accuracy, and longevity. Manufactured to Heckler & Koch’s exacting standards, it features a...

Nefarious Arms HK MR556 A3/416 A5 Barrel Nut Whether replacing a barrel nut or sourcing the best parts for your build, the Nefarious MR556/416 barrel nut is an excellent option.  Meticulously crafted in the US to the highest quality standards...

H&K MR556 A4/416 A5 2.4mm Gas Vent Screw German 2.4mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4

Nefarious Arms HK MR556416 10.4" A5 Barrel An expertly crafted 10.4" barrel designed for the HK MR556 and 416 platforms. Featuring the A5 profile, this barrel balances durability and weight, making it an excellent choice for both tactical and...

Nefarious Arms HK MR556/HK416 11" A5 Barrel ***THE BARREL EXTENSION RIM IS MARKED "HAUS" DUE TO AN ERROR BY THE BARREL EXTENSION SUPPLIER.  THE MARKING IS NOT VISIBLE ONCE INSTALLED.  THESE BARRELS ARE GENUINE NEFARIOUS BARRELS AS NEFARIOUS...

Upper Conversion Kit for HK416 and MR556 8 inch barrel - 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 8" barrel conversion kit for 416 or MR556. Each conversion kit...

H&K MR556 A4/416 A5 1.3mm Gas Vent Screw The 1.3mm gas vent screw is the standard size installed at the factory on the MR556 A4. Compatible With: HK MR556 A4