I also do restorations and refinishing work. I bead blast the old finish off then polish on a wheel (buffer).. The $60 price sounds pretty reasonable to me for the slide work... Sending the slide off to a shop equiped to do that kind of work (IMO) is better than doing it yourself with a rag and polish..
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" Guns have only two enemies: RUST & POLITICIANS"
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The U.S. Constitution: The 2nd Amendment is in place in case the Poloticians ignore the others"