I polished the chambers in the Ti cylinder on my 625. They had a really lousy surface finish, ended up using a 220 grit sandpaper roll 'cause less did nothing. No signs of any problems, chambers look perfect. Gets cleaned with Hoppe's #9 and a .475 or .50 cal bore brush in a drill motor before each match and there's alot of rounds thru the gun since polishing.
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