Dark Storm Industries AR-15 .300 AAC Blackout Threaded AR Barrel 7.5inch SOCOM Pistol Length 1-8 Twist Nitride Black. 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. Specifications for Dark Storm Industries AR-15 .300 AAC Blackout Threaded AR Barrel: Manufacturer: Dark Storm Industries Color: Black Finish: Nitride Caliber: .300 AAC Blackout Barrel Profile: SOCOM Gas System Length: Pistol Length Gas Block Journal Size-Diameter: .750 in Barrel Twist Rate: 1-8 Barrel Material: Steel Flutes: No Gun Make: AR Platform Gun Model: AR-15 Firearms Threads Per Inch: 5/8x24 Package Contents: Dark Storm Industries AR-15 .300 AAC Blackout Threaded AR Barrel What firearm models does the manufacturer say Dark Storm Industries AR-15 .300 AAC Blackout Threaded AR Barrel is compatible with? The manufacturer says that Dark Storm Industries AR-15 .300 AAC Blackout Threaded AR Barrel is compatible with AR-15Dark Storm Industries DSI-BRL-300SC-7P8T-NIT: AR-15 .300 AAC Blackout Threaded AR Barrel 7.5inch SOCOM Pistol Length 1-8 Twist Nitride Black