i am asking for friend who just called me, he just got a remington 22lr. from what he told me its an older gun, when he shoots it the gun sprays powder back in his face. no gunsmiths close by but our local shop told him to sleeve it. he asked about making it a magnum but the way its made he was told that it couldn't be done and sleeve was his only choice. where can he buy these?, or is it gunsmith only job? i had no clue so i thought i would ask, thanks for any help.