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Hi Danny, this has a 16-inch nitride coated 4150 Chrome-Moly-Vanadium Steel barrel, HBAR profile, with a 1:7 twist rate. Stay safe & have a great day!

Hi Danny and welcome to the forum. 1 in 7 inches. Full Barrel specifications here: BARREL 16-inch nitride coated barrel; 1:7 twist HBAR profile 4150 Chrome-Moly-Vanadium Steel MIL-B-11595 MPI/HP tested High pressure tested, MPI after proof firing A2-style flash hider, 1/2"x28 TPI ---------- Cheers, stay safe and enjoy!