Engineered to be lightweight balanced and accurate - Key Features - 416 stainless steel - Profile specifically designed to be lightweight and accurate - Fluted and contoured to reduce weight while maintaining strength; also available without flutes - M4 barrel extension - 1/2 x 28 thread pitch - 1:7 twist rate rifling - .223 Wylde chambered - .750 at the gas block - Rifle-length gas system - 18.8 inches - 1 lb. 13 oz.