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Hi Terry and welcome. Barrel twist rate is 1 in 9 inches. 18" 4140 Steel Threaded Barrel with a 1:9 Twist Rate and Threaded Muzzle: 5/8x24. Cheers and stay safe!

Specs: Bolt Action Rifle .223 Remington 4 Rounds 18" 4140 Steel Threaded Barrel Barrel Twist 1:9 Twist Threaded Muzzle: 5/8x24 Picatinny Scope Bases Dual Swivel Stud Compatible with mounts for the Savage 110 AccuTrigger Round Knob Bolt Handle Flush Fitting Magazines 70 Degree Bolt Throw Spacer for Stock Adjustment Veil Tac Black Stock Graphite Black Cerakote Finish

Hi Terry, the 18" 4140 Steel Threaded Barrel has a 1:9 Twist Rate and Threaded Muzzle: 5/8x24. Stay safe & have a great day!