Diamondback AR-15 Barrel Features The Diamondback Barrel in 300 AAC Blackout is cut to a 10.5 length with a 1 in 8 twist rate a combination well suited to stabilizing both lighter supersonic loads and the heavier subsonic bullets that 300 Blackout shooters often favor. This twist rate gives builders flexibility to run a wide range of ammunition through the same barrel without needing to swap components based on load type. The compact 10.5 length keeps an AR-15 pistol or SBR build short and maneuverable which is one of the primary reasons shooters choose the 300 Blackout cartridge in the first place. A Black Melonite finish is applied to protect the bore and exterior surfaces from corrosion heat and the wear that comes from repeated firing extending the service life of the barrel under hard use. Built to fit the AR-15 platform directly this barrel allows builders to put together a complete upper or replace a worn or damaged barrel on an existing rifle or pistol build. For shooters building a dedicated 300 Blackout AR-15 platform the Diamondback Barrel offers a durable well twisted option available for sale at GrabAGun. Diamondback AR-15 Barrel Specifications Manufacturer: Diamondback Model: AR Barrel Caliber: .300 AAC Blackout Compatible Hosts: AR-15 Color: Black Melonite Twist Rate: 1:8 Barrel Length: 10.5 Available At: GrabAGun