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Hi Turrell and welcome. This model has an 11.50" 4150 CoM0V QPQ (Black Nitride Barrel) with a 1:7 twist rate and threaded 1/2"x28 tpi. Cheers and stay safe!

The barrel of the Sons of Liberty 556 VEGAS 11.5 is made from 4150 chrome moly vanadium steel. This steel is used in accordance with MIL-B-11595E. Barrel features Finish: The barrel has a QPQ Nitride finish that is corrosion resistant Chamber: The barrel has a 5.56 NATO chamber Gas system: The barrel has a carbine gas system Twist rate: The barrel has a 1/7 twist rate Muzzle: The barrel has a 1/2-28 threaded muzzle Gas block: The barrel has a .750 inch gas block journal Testing: The barrel is high pressure tested and magnetic particle inspected