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John, this has a 22 inch fluted barrel with a 1:10 Twist and a threaded muzzle with 5/8x24 thread pitch. Hope this helps.

John, this rifle has a 22" Fluted Threaded Barrel that is Button Rifled with a 1:10 Twist Rate, Threaded Muzzle 5/8x24 TPI and has a Spiral Fluted Bolt. Cheers and stay safe!

John, the muzzle is threaded 5/8 x 24 with a 1:10 twist rate. Have a great day!