Faxon Firearms Big Gunner Features The Faxon Firearms Big Gunner barrel is machined from raw 4150 CMV bar stock at Faxon s greater Cincinnati facility then button rifled for consistent repeatable accuracy shot after shot. Every barrel is fully stress relieved and air gauge tested before being Magnetic Particle Inspected to catch any hidden flaws so shooters get a barrel that has been checked at every stage of production. The 11 degree target crown protects the critical muzzle end of the bore from dings and dents that can degrade accuracy over time. Each barrel is individually checked for headspace with precision custom hardened gauges backing the reliability that a AR-10 platform demands in the field or at the range. The Salt Bath Nitride finish on both the inside and outside of the barrel adds meaningful wear resistance and corrosion protection compared to a bare steel finish extending service life under hard use. An M18x1.5 tapered shoulder muzzle thread with an included adapter gives shooters mounting flexibility for muzzle devices without sourcing a separate part. At 2.2 lbs and 16 in length with a carbine length gas system this Big Gunner barrel balances a manageable weight with the barrel length needed to run the 8.6 Blackout cartridge effectively. Backed by the Faxon Lifetime Guarantee this barrel is built to be the foundation of a dependable AR-10 rifle build. Faxon Firearms Big Gunner Specifications Brand: Faxon Firearms Model: Big Gunner Type: Rifle Barrel Caliber: 8.6 Blackout Compatible Hosts: AR-10 Barrel Length: 16 Barrel Twist: 1:3 Barrel Material: 4150 CMV Steel Rifling: Button Barrel Profile: Big Gunner Gas System Length: Carbine Finish: Salt Bath Nitride Muzzle Thread: M18x1.5 Tapered Shoulder Adapter Included Gas Block Diameter: .875 Barrel Extension: Standard DPMS Gen 1 .308 Extension Black Oxide Weight: 2.2 lbs Available At: GrabAGun