This Ballistic Advantage AR-15 Barrel 16″ -.223Wylde is machined from 416R Stainless Steel with a bead blasted finish. Ballistic Advantage’s Premium Series Barrels feature a Nickel Boron Coated Extended M4 Feed Ramp Extension. Hanson Series Barrels feature their proprietary BA Hanson profile and include a pinned lo-pro gas block that is .750″ sized. This Barrel is 1/2×28 threaded for muzzle devices, and is a mid-length gas system. Finally this barrel has a 1:8 twist rate and weighs 27 oz. Hanson barrels are not designed to work with aftermarket piston kits.