Colt Firearms M4CQB Replacement Barrel 10.3 5.56

Colt M4CQB Replacement Barrel Features Built to Colt s legendary standards this barrel features a carbine-length gas system for smooth cycling and reliable operation. The 1:7 twist rate ensures optimal performance with a variety of bullet weights particularly heavier projectiles. Precision-crafted with a black finish this barrel offers excellent durability and corrosion resistance for extended service life. Colt M4CQB Replacement Barrel Specifications Cartridge: 5.56 mm NATO Length: 10.