Description The Faxon Firearms Duty Series Big Gunner is a 16-inch AR-10 barrel chambered for .308 Winchester / 7.62 NATO. It uses a medium taper behind a .750″ gas block journal and a thinner taper forward for reduced weight while retaining rigidity. The barrel is finished with a nitride surface, includes a mid-length gas port, and is threaded for common muzzle accessories. Key Specifications The barrel length is 16 inches. The cartridge is .308 Winchester / 7.62 NATO. The rate of twist is 1:10. The finish is Nitride. The contour is the Big Gunner profile. The gas system is Mid-Length with a gas block journal of .750 inches and a journal length of 1.9 inches. The muzzle threads are 5/8-24. The muzzle features an 11-degree target crown. The listed weight is 1.91 lbs. Designed to fit AR-10 platforms. Engineered for duty use, competition, and applications where durability and straightforward performance matter, this Barrel balances stiffness and weight with a profile optimized for reliability and accessory compatibility. Its nitride finish and threaded muzzle provide a low-maintenance surface and easy attachment of muzzle devices, while the mid-length gas system and .750″ gas journal accommodate common gas blocks and a range of setups. The Big Gunner contour offers a solid platform when consistent shot-to-shot behavior is important without excess bulk.