This .308 chambered (DPMS style) 12.5 inch Tactical Government Profile Modern Series Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension. All NFA/ATF Rules Apply You may use this barrel with a lower receiver that is a Registered SBR, Machine Gun, or Pistol. Possession of this barrel along with a Non-NFA lower receiver is Prohibited, except when installed on a Pistol configuration firearm. Additional Info Material: 4150 Chrome Moly Vanadium Finish: QPQ Corrosion Resistant Gas Block Journal: .750" Twist Rate: 1:10 inches Muzzle: 5/8x24 Threaded Mfg: Ballistic Advantage