Lead & Steel MonoBloc M4 5.56mm Threaded Barrel 13.9in Mid Length 1-8 Twist Black 111322. Chambered in 5.56 NATO/223 Rem the 4150 Chromoly Vanadium barrel comes in various lengths. This barrel features a 1:8 twist ratio and a mid-length gas system...
Lead & Steel MonoBloc M4 5.56mm Threaded Barrel 13.9in Mid Length 1-8 Twist Black 111322. Chambered in 5.56 NATO/223 Rem the 4150 Chromoly Vanadium barrel comes in various lengths. This barrel features a 1:8 twist ratio and a mid-length gas system...