Black Rain Ordnance BRO-22 Crowned Barrel .22 LR 18 Black E1516E3E IR. 22LR barrels crowned or threaded each individual customer has the opportunity to select a BRO-22 barrel that fits their specific needs. Both products are 18 in length and made of 4150V Nitrided Steel. This product features a Bentz Chamber with a 1:16 6-groove twist rate that is laser engraved on the barrel. Threaded barrels include a BRO-22 A2 thread protector. Not compatible with AR-22 style rifles. Specifications for Black Rain Ordnance BRO-22 Crowned Barrel .22 LR 18 Black E1516E3E: Manufacturer: Black Rain Ordnance Barrel Twist Rate: 1-16 Features of Black Rain Ordnance BRO-22 Crowned Barrel .22 LR 18 Black: Two different styles of .22LR barrels crowned or threaded Individual customer has the opportunity to select a BRO-22 barrel Products are 18 in length and made of 4150V Nitrided Steel Features a Bentz Chamber with a 1:16 6-groove twist rate Laser engraved on the barrel Threaded barrels include a BRO-22 A2 thread protector Package Contents: Black Rain Ordnance BRO-22 Crowned Barrel .22 LR 18 Black Offering two different styles of .22LR barrels crowned or threaded each individual customer has the opportunity to select a BRO-22 barrel that fits their specific needs. Both products are 18 in length and made of 4150V Nitrided Steel. This product features a Bentz Chamber with a 1:16 6-groove twist rate that is laser engraved on the barrel. Threaded barrels include a BRO-22 A2 thread protector. Not compatible with AR-22 style rifles. IRBRL2218CMNAA2BLK