Lead & Steel AR-15 .300 AAC Blackout Threaded AR Barrel 5in Medium Micro Length 1-5 Twist 5/8x24 Nitride Black. Specifications for Lead & Steel AR-15 .300 AAC Blackout Threaded AR Barrel: Manufacturer: Lead & Steel Color: Black Finish: Nitride Fabric/Material: 4150 Chrome-Moly Vanadium Steel Caliber: .300 AAC Blackout Gas Block Journal Size-Diameter: .750 in Flutes: No Gun Make: AR Platform Gun Model: AR-15 Condition: New Firearms Threads Per Inch: 5/8x24 Features of Lead & Steel AR-15 .300 AAC Blackout Threaded AR Barrel Dimpled barrel to ensure proper gas block alignment Package Contents: Lead & Steel AR-15 .300 AAC Blackout Threaded AR Barrel What firearm models does the manufacturer say Lead & Steel AR-15 .300 AAC Blackout Threaded AR Barrel is compatible with? The manufacturer suggests that Lead & Steel AR-15 .300 AAC Blackout Threaded AR Barrel is compatible with AR-15Lead & Steel 103255: AR-15 .300 AAC Blackout Threaded AR Barrel 5in Medium Micro Length 1-5 Twist 5/8x24 Nitride Black