Proof Research 100530 AR-Style Barrel 300 Blackout 12.50″ Pistol Length Gas System 1:7″ Twist 5 Grooves, 5/8″-24 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.