The Faxon Duty Series 10.5" Gunner 300 BLK barrel combines exceptional balance and durability for short, versatile builds. Our Gunner profile merges the robustness of a Gov t contour with the lightweight maneuverability of a Pencil profile ideal for CQB, suppressed, or compact rifle setups. Machined from 4150 CMV steel and button rifled with a 1:8 twist, each barrel is fully stress relieved and treated with salt bath nitride inside and out for superior corrosion resistance and long service life. Every Faxon barrel is air-gauge tested, MPI inspected, and headspace checked for reliability and accuracy straight out of the box. Product Features Gunner Profile: Combines Gov t strength with Pencil weight savings for excellent balance. Pistol-Length Gas: Optimized for 300 BLK reliability with subsonic and supersonic loads. 4150 CMV Construction: Mil-spec steel for rugged performance and heat resistance. Nitride Finish: Salt bath nitride inside & out enhances longevity and corrosion protection. Quality Control: Stress relieved, air-gauge tested, MPI, and headspace verified. Product Specifications Caliber / Chamber: 300 Blackout (300 BLK) Length: 10.5" Profile: Gunner Gas System: Pistol-Length Material 4150 CMV Rifling Method: Button-Rifled; 1:8 Twist Finish: Salt Bath Nitride (inside & out) Muzzle Threads: 5/8x24 Gas Block Diameter: .750" Gas Block Journal: Length 1.9" Barrel Extension: M4 Weight: 1.10 lbs Crown: 11 Target Crown