have a friend w/ a gun store..he showed me how they clean up trade in's w/ rust..liberly cote the gun w/ hoppies # 9 and let it soak over night..take oooo steel wool make a pad and soak it w/ hoppies and have at the rust..it'll nock off the surface rust..but a pit is a pit.it,ll clean em up ..but won't take a pit out..i duck hunt and live no more that 20' from salt water..i've used G96 spray ..and never had a rusty gun..the stuff flat works