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1:7 twist see *******Firearm Specifications Model Number: STV909300B Caliber: 300 Blackout Barrel: 9" CMV 300BO w/ Melonite® Treatment;******* 1:7 Twist Gas System: Direct Impingement Pistol-Length Gas Port w/ Adjustable Gas Block Overall Length: 27.75" Trigger: Enhanced Nickel Boron Coated Single Stage Flat Trigger Trigger Guard: Bravo Company Trigger Guard Pistol Grip: Bravo Company Mod 3 Handguard: M-LOK Aluminum SA Patent Pending Free Float with SA Locking Tabs and Forward Hand Stop Forearm Brace: SB Tactical - SBX-K Charging Handle: GI Style Bolt Carrier Group: Enhanced M16; MPT; Melonite® Finish w/ 9310 Steel Bolt Magazine:(1) 30 Round Magpul PMAG Weight: 5lbs 9oz without magazine

Gary, this pistol has a 9 Inch Chrome Moly Vanadium Barrel with a 1 in 7 Twist Rate Sir.