Black Rain Ordnance Crowned Barrel Features The Black Rain Ordnance Crowned Barrel is machined from 4150V nitrided steel a chrome moly alloy treated with a nitriding process that improves wear resistance and helps the barrel shed heat and fouling during extended rimfire shooting sessions. A Bentz chamber is cut into the barrel a chamber design favored in .22 LR barrels for its tight tolerances and consistent feeding across a range of ammunition types. The 1:16 six groove twist rate is laser engraved directly onto the barrel giving the shooter a quick visual reference without relying on paperwork or memory. At 18 inches in length the barrel is sized to balance rimfire velocity with manageable overall rifle length. Finished with a crowned muzzle rather than threads this barrel protects the rifling at the muzzle from dings and dents that can affect accuracy while keeping a clean profile with no exposed threads to snag. It is purpose built for the Black Rain Ordnance BRO-22 platform and is explicitly not compatible with AR-22 style rifles so shooters should confirm their platform before ordering. This crowned configuration is one of two barrel styles offered for the BRO-22 the other being a threaded option with an included thread protector. The Black Rain Ordnance Crowned Barrel is a direct fit upgrade available for sale at GrabAGun for BRO-22 owners. Black Rain Ordnance Crowned Barrel Specifications Manufacturer: Black Rain Ordnance Model: Crowned Barrel Compatible Hosts: BRO-22 Caliber: .22 LR Barrel Length: 18 Barrel Material: Steel Barrel Type: Crowned Twist Rate: 1:16 Color: Black Available At: GrabAGun