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The twist rate is 1:7 for the CMMG banshee 12.5" pistol in 5.56.

12.5" 4140 Steel Medium Taper Barrel with a 1:7 Twist see ******Specifications and Features: CMMG Inc. Banshee 100 Mk4 55ADF13 AR15 Style Semi Automatic Pistol 5.56 NATO (also accepts .223 Remington) 30 Rounds ******** 12.5" 4140 Steel Medium Taper Barrel with a 1:7 Twist Threaded Muzzle 1/2x28 TPI with A2 Comp 7075-T6 Aluminum Receivers Forged Upper CMMG RML11 M-LOK Handguard Full Length Picatinny Top Rail CMMG A2 Pistol Grip Single Stage Mil-Spec Trigger Black Finish Length 28.3" Weight 5 lbs 7 oz Made In The USA

Dave, this Pistol has a 12.5" 4140 Steel Medium Taper Barrel with a 1:7 Twist and Threaded Muzzle 1/2x28 TPI with A2 Comp. Cheers and stay safe!