Nitromet 5.56 7.5" Barrel 1:7 GP Pistol Gas System with NiB-X Barrel Extension

Description

High Quality, Nitromet™ 5.56 Barrel 7.5" HBAR barrel has been treated with Nitromet™ (salt bath nitrocarburized) inside and out with a hardened finish that results in a bore life 40% greater than with traditional chrome-lining without affecting accuracy. Barrels are made of 4150 Chrome Moly Vanadium steel, chambered for 5.56mm NATO, button rifled with 1-7" twist rifling, and machined to a standard AR pistol heavy profile. Gas port drilled for a pistol length gas system, .750" diameter at the gas block. Comes with a NiB-X™ coated barrel extension for a smooth locking/unlocking with the bolt.