Ballistic Advantage Hanson w/ lo pro Premium Series.300 AR Barrel Pistol Length Black 8.3 in. 300 Blackout chambered 10.3 inch Performance Series Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish. Our Performance Series Barrels feature a Nickel Boron Coated M4 Feed Ramp Extension and are HP and MPI tested. Hanson Series Barrels feature our proprietary BA Hanson profile and include a pinned lo-pro gas block. Hanson barrels are not designed to work with aftermarket piston kits. Specifications for Ballistic Advantage Performance Series .300 Blackout for AR-15 Rifle Barrels: Manufacturer: Ballistic Advantage Color: Black Finish: QPQ Corrosion Resistant Fabric/Material: 4150 Chrome Moly Vanadium Caliber: .300 AAC Blackout Barrel Profile: Hanson Gas System Length: Pistol Length Threads per Inch: 5/8x24 Barrel Twist Rate: 1-7 Additional Features: Seat for .750 Low Profile Gas Blocks Only Condition: New Country of Origin: USA Package Contents: Ballistic Advantage Performance Series AR Rifle Barrels Ballistic Advantage BABL300002F: Hanson w/ lo pro Premium Series.300 AR Barrel Black 8.3 in