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 18a ^2 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.