The Guntec USA BAR-16 16" 5.56mm 1:8 Twist M4 4150 Barrel delivers exceptional performance suited for both enthusiasts and professionals. Engineered from premium 4150 Chromoly Steel, this barrel ensures reliability and unmatched accuracy in every shot. With a lightweight M4 contour and a robust black nitride finish, it offers superior corrosion resistance, making it ideal for diverse shooting scenarios. Chambered in 5.56x45 with 1:8 twist rate for enhanced accuracy M4 contour profile for lightweight versatility Black nitride coating for superior corrosion resistance M4 feed ramps and carbine length gas system for smooth cycling Engraved markings for easy identification .750 gas block platform for hassle-free installation Compatible with 1/2 by 28 threaded muzzle devices Optimize your firearm's capabilities with the Guntec USA BAR-16 barrel, crafted for peak performance.