Dark Storm Industries AR-15 .300 Blackout SOCOM Threaded Barrel 12.5in 1-8 Twist Black. 300 Blackout 12.5" Barrel Optimized for AR-style pistol and SBR builds the DSI 7.5" .300 Blackout Barrel offers reliable subsonic and supersonic performance. Constructed from premium 4142 Chromoly and nitride treated for durability it's the perfect foundation for your next suppressed or tactical upper. Length: 12.5" Chamber: .300 Blackout Gas System: Pistol Length Gas Block Diameter: .750" Rifling: 1 in 8 Twist Rate Material: 4142 Chromoly Steel Finish: Nitride Treated for Long Life and Corrosion Resistance Threaded: 5/8x24 Specifications for Dark Storm Industries AR-15 .300 Blackout SOCOM Threaded Barrel: Manufacturer: Dark Storm Industries Color: Black Finish: Nitride Fabric/Material: 4142 Steel Caliber: .300 AAC Blackout Barrel Length: 12.5 in Barrel Profile: SOCOM Gas System Length: Pistol Length Gas Block Journal Size-Diameter: .750 in Barrel Twist Rate: 1-8 Flutes: Straight Gun Make: AR Platform Gun Model: AR-15 Weight: 2 lb Firearms Threads Per Inch: 5/8x24 Features of Dark Storm Industries AR-15 .300 Blackout SOCOM Threaded Barrel Nitride treated for long life and corrosion resistance Package Contents: Dark Storm Industries AR-15 .300 Blackout SOCOM Threaded Barrel What firearm models does the manufacturer say Dark Storm Industries AR-15 .300 Blackout SOCOM Threaded Barrel is compatible with? The manufacturer says that Dark Storm Industries AR-15 .300 Blackout SOCOM Threaded Barrel is compatible with AR-15Dark Storm Industries DSI-BRL-300SC-12P7T-NT: AR-15 .300 Blackout SOCOM Threaded Barrel 12.5in 1-8 Twist Black