Description Upgrade your AR-15 with the Ballistic Advantage 12.5″ Modern Series Barrel. Chambered in 5.56x45mm NATO, this barrel is crafted from durable 4150 Chrome Moly Vanadium steel and features a QPQ corrosion-resistant finish for enhanced longevity. With a 1-7 twist rate and a government profile, it includes a 750″ gas block journal for reliable gas flow and is compatible with carbine-length gas systems. Whether you’re building a pistol or a short-barreled rifle (SBR), this high-quality barrel ensures optimal performance and precision. Elevate your shooting experience with this premium AR-15 barrel from Ballistic Advantage.