Enhance your patrol or duty carbine build with the Rosco Manufacturing Bloodline 14.5" 5.56 NATO M4 Barrel. Expertly crafted for the M4 platform this barrel features a 1:7 twist rate and a durable nitride finish ensuring reliable performance and longevity. The Bloodline series represents a significant evolution in barrel design making it an ideal choice for those seeking precision and durability in their firearms.