Chambered in the popular .308 Winchester, these GLFA AR10 rifles feature an 18" barrel in your choice of a beautiful 416r stainless steel or an ultra-smooth 4150 CRMOV black nitride finish with a 1:10" twist. These barrels have 5R rifling, as well as being double thermally stress-relieved and air-gauged. The .308 Winchester caliber is a phenomenal all-purpose cartridge, from target shooting at the static range, long-distance precision shooting, or hunting, .308 packs a heavy punch. The heavy barrel incorporates a rifle-length gas tube, with 0.750 Gas Block. The barrel is threaded in 5/8x24 and is fitted with a ported compensator hand tightened to the firearm. Each barrel is surrounded by a 15.25" 6061 aluminum M-Lok handguard with a disrupted picatinny rail on top, allowing you to both attach the different accessories you may require and C-clamp the weapon to help increase stability.