This 5.56 NATO chambered 12.5 inch 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

• Length: 12.5";Material: 4150 Chrome Moly Vanadium"
• Profile: Government
• Finish: QPQ Corrosion Resistant
• Gas System Length: Carbine
• Gas Block Journal: .750";Twist Rate: 1:7 inches"
• Muzzle: 1/2×28 Threaded
• Weight: 22 oz