This Barrett factory conversion kit rechambers a small-breech MRAD rifle to 308 Win with a 17" carbon fiber wrapped barrel in a 1:10 twist. It is a complete caliber swap rather than a bare barrel: the kit includes the barrel, matched bolt head, magazine, muzzle brake, and a storage bag, so the change-over happens at the bench with no gunsmithing.Fitment is specific to small-breech MRAD receivers with AJ or CJ serial prefixes. For MRAD owners who want a lighter, handier 308 setup alongside their long-range chambering, this is the factory-supported way to get there.