Proof Research 100387 AR-Style Barrel 223 Wylde 11.50″ Rifle Length Gas System 1:7″ Twist 4 Grooves, 1/2″-28 tpi, Stainless Stainless

An optimum combination of high tensile strength along with requisite toughness to withstand extreme chamber pressures encountered during firing. Excellent erosion wear characteristics and corrosion resistance.