Faxon Firearms Duty Series Barrel Features The Faxon Firearms Duty Series barrel is button-rifled and chambered in .300 AAC Blackout with a 1:8 twist rate a stabilizing rate suited to both lightweight supersonic loads and heavier subsonic projectiles favored for suppressed shooting. The barrel measures 10.5 and carries a .750 gas block diameter dropping straight into compatible AR builds without modification. A pistol-length gas port keeps the system tuned for reliable cycling in a short-barrel configuration. An 11-degree target crown at the muzzle helps protect accuracy by keeping the bore s edge consistent shot to shot. Built from 4150 CMV steel the barrel is chrome-lined on the inside for smoother cycling and easier long-term cleaning while the exterior wears a black chrome mag phosphate finish for corrosion resistance. Its 5/8x24 threaded muzzle accepts a suppressor or muzzle device directly giving shooters flexibility for suppressed or unsuppressed use. At 1.10 lbs the barrel keeps a short-barrel build light and maneuverable without sacrificing durability. The Faxon Duty Series .300 AAC Blackout barrel is a solid upgrade for shooters building a compact versatile AR platform. Faxon Firearms Duty Series Barrel Specifications Manufacturer: Faxon Firearms Model: Duty Series Barrel Caliber: .300 AAC Blackout Color: Black Finish: Chrome Mag Phosphate Barrel Type: Button Rifled Twist Rate: 1:8 Barrel Length: 10.5 Diameter: .750 Thread Pattern: 5/8x24 Weight: 1.10 lbs Available At: GrabAGun