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Hi Seth, Tacfire says model BU-556-5 has a 1:5 twist rate >>> http://www.tacfireinc.com/-built-5-5-56-nato-complete-upper-assembly-p-1078.html Stay safe & have a great day!

Hi Seth and welcome. Barrel twist rate is 1 in 7 inches. TACFIRE Customer Service can verify this at 909-628-4848 PST. Cheers, stay safe and enjoy!