Barrel Sub Assembly Perfect for building your custom AR15 upper group - Comes with properly installed M4 barrel extension - All barrel sub-assemblies are properly headspaced Description: Caliber 5.56x45mm Barrel Length 16.1 Barrel Twist 1:7 Barrel Contour MT Barrel Twist 1:7 Muzzle Thread 1/2 X 28 Gas Port Location Mid Gas Block 0.750 Weight 1.56 lbs
CMMG | MPN: CMM55DC70A | UPC: 815835016153
