The Faxon Firearms Duty Series Big Bore Barrel in .308 Win 1:10 Twist 4150 Nitride delivers the big-bore performance needed for duty and competition, featuring the Big Gunner profile with a medium-taper behind the gas block and a .750" gas block journal for broad compatibility with common blocks and a 1.9" journal length for long blocks or aftermarket piston kits. From the gas block journal forward, a thinner taper reduces weight while preserving rigidity for high rates of fire and reliable suppressor-host performance, making it an ideal choice for AR-10 platforms requiring strength and consistency. This 18" rifle-length gas system barrel is button-rifled in 4150 CMV and finished in Salt Bath Nitride both inside and out, offering enhanced wear resistance and lubrication retention for sustained accuracy. The 11-degree target crown ensures precision at distance, while the 5/8-24 muzzle thread and LR-308 (DPMS compatible) extension provide straightforward installation with a wide range of accessories. Weighing just 2.13 lbs, this Faxon barrel balances maneuverability with stiffness, making it a dependable option for fast-paced competition or duty scenarios where seconds count.