Advanced Technology Coatings For Extended Service Life & Superb Performance
Match-quality barrels feature exotic coatings to give them maximum wear resistance and durability that standard barrel finishes just can’t match. Nitromet™ barrel has been nitrocarburized inside and out with a hardened finish that results in a bore life 50% greater than with traditional chrome-lining. Comes in a 1-9" twist. NiB-X™ barrel has the same bore treatment, plus the exterior is coated with WMD’s unique NiB-X nickel boron finish for outstanding surface wear resistance and heat dissipation. Both barrels are made of 4150 steel, chambered for 5.56mm NATO, button rifled with 1-7" twist rifling, and machined to a standard M4 exterior profile with the M203 grenade-launcher cutout. Both come with a NiB-X coated barrel extension installed to help the bolt unlock exceptionally smoothly, especially when used with a WMD NiB-X coated bolt (available separately). Barrel extension has M4-type feed cuts to aid in smooth cycling.
AR-15, Issue:09, Page:018
Big Book Catalog, Issue:66, Page:018
SPECS: 4150 carbon steel, Nitromet (black) or NiB-X (silver) finish. 16" OAL. Standard M4 carbine-length gas system. Chambered for 5.56x45mm NATO. Nitromet has 1-9” twist. NiB-X has 1-7" twist. ½"-28 tpi muzzle threads. Use .750" diameter gas block.