I bought a 64-7 off gunbroker. The statement about the gun was it was a police trade in; I picked the revolver up yesterday and oh my it is the dirtiest and had a some minor surface rust. I took it apart and began to clean, 2 hour later and it looks totally different, but there is a a peice of a copper jacket left in there. This is what I have tried hoppes synthetic, butcher's bore shine and brush and many patches. Now what I have tried is leaving a patch were the piece is and dumping some hoppes and letting it sit for extended periods of time.