Faxon Duty Series 7.5 Gunner 300 BLK AR-15 Barrel (Pistol-Length Gas) – 4150 CMV — Button Rifled — Gunner Lightweight Profile — Nitride Inside & Out — MPI & Headspace Checked – The Faxon Duty Series 7.5 Gunner 300 BLK delivers reliable performance in a compact package. Our Gunner profile blends Gov’t durability behind the gas block with a lighter forward section to reduce front-end weight speed transitions and keep your build balanced. – Machined in-house from 4150 CMV button rifled in a versatile 1:8 twist and salt bath nitride treated inside & out for corrosion and wear resistance. Every Duty barrel is stress relieved air-gauge tested magnetic particle inspected and individually headspace verified for safety and consistency. – Key Benefits – Gunner profile: Ideal balance-sturdy behind the gas block with weight savings up front. – Pistol-length gas: Tuned for 300 BLK cycling including common subsonic and suppressed setups. – 4150 CMV + Nitride: Hard-wearing steel with black nitride inside & out for longevity. – 1:8 twist: Stabilizes a wide range of 300 BLK bullet weights. – Rigorous QC: Stress relieved air-gauge tested MPI and headspace checked in-house. – Specifications – Caliber / Chamber 300 Blackout (300 BLK) – Length 7.5 – Profile Gunner – Gas System Pistol-Length – Material 4150 CMV – Rifling Method Button-Rifled; 1:8 Twist – Finish Salt Bath Nitride (inside & out) – Muzzle Threads 5/8×24 – Gas Block Diameter .750 – Gas Block Journal Length 1.9 – Barrel Extension M4 – Weight 0.87 lbs – Crown 11° Target Crown