Proof Research AR-Style Barrel 223 11.5" 1:7 Twist delivers unmatched durability and precision for firearm enthusiasts looking for high-performance components. Crafted with stainless steel it combines high tensile strength and toughness to endure extreme chamber pressures during firing. Featuring excellent erosion resistance and outstanding corrosion protection this rifled carbine-length barrel offers a superior lifespan. Its 1/2-28 thread and 4-groove design ensure top-notch accuracy making it a standout choice for your AR build.