Rosco Manufacturing

Rosco Manufacturing Bloodline 11.5" M4 Profile 5.56 NATO AR-15 Barrel Build a compact, capable AR-15 with the Rosco Manufacturing Bloodline 11.5-inch M4 Profile 5.56 NATO Barrel. Engineered for modern carbine applications, this nitrided 4150 CMV barrel combines a carbine-length gas system, 1:7 twist rate, and practical M4 profile for dependable performance in short-barreled rifle and p