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Polishing the internals of a gun will reduce drag between the main gun body and the internal moving parts. I believe you can get it done at an airsmith buy depending on the gun you can do it yourslef. Everybody has their own way of doing it but it usually consists of using high grit sand paper (400-1200) and then some type of polish, such as mother mags. Gun bodies can be done with a shotgun wire brush cleaner spinning on a drill, a honing stone, or a gun polishing wheel with some polish. It is nice to atleast polish the areas on the bolt that get scratched and high friction areas.
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