i found a .22 lr once that was heavily rusted. i got an sos pad some steel wool and scrubbed the crap out of the gun under the sink to wash away the rust. once i finished the gun looked silver and i thought i had ruined it. i went to a local sporting goods center and bought some blueing liquid and applied it over the whole gun as the directions said and when i finished the gun looked like new. just a thought if ur gun is very rusted