I bought a Lindner Daly featherweight 12ga from the 'for sale' section here a few weeks ago. When it arrived I balled out the seller when the bores he had represented as good looked like two matching sewer pipes.

I was so disgusted I put the gun away for a while before making any attempt to clean it up. When I spun a bronze brush wrapped with 4 ought steel wool soaked in WD40 through them, the bores transformed into mirrors. I apologized to the seller and it turned out his FFL had test fired the gun a bit without cleaning before he shipped it to my FFL.

After I cleaned it up I checked it again and the rust was back. I've still never fired the gun, but I will try some of the remedies posted in this thread. Does anyone think I may have a case of live rust which might benefit from a Naval Jelly treatment?...Geo