300 Blackout pistol-length barrel, 10.5 inches, Gov't/SOCOM profile designed for pistol gas system. Supports standard and subsonic ammo. Faxon barrels are manufactured in-house, stress-relieved, air-gauge tested, and finished with an 11-degree target crown for precision. Materials include certified 4150 Mil-Spec steel or 416-R stainless. Barrel finish: QPQ.