CMMG AR-15 Barrel 8″ -.300Blackout is perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced. This barrel is made of 4140 Chrome Moly wit ha salt bath nitride finish inside and out. The CMMG AR-15 Barrel 8″ -.300Blackout comes as a 1:7 twist rate and a pistol length gas system sized for a .750 gas block. The barrel is treaded 5/8×24 for muzzle devices.
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