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10.5 4150 Chromoly Barrel. I could not find a twist rate listing so I suggest you contact Black Rain for a accurate answer https://blackrainordnance.com/contact-us/

DeWayne, 10.5" 4150 Chromoly Barrel, twist is 1:7.

DeWayne, this rifle has a 10.5" 4150 Chormoly Barrel with a Black Ntride finish, A2 flash hider, Twist Rate of 1:7" and Thread Pattern of1 / 2"-28 tpi. Cheers and stay safe!