Stoning and smoothing of parts is often worthwhile, but if not done properly can ruin parts and be pretty expensive in the long run. Further, any work that results in the gun being unsafe could create a real problem.
Also, the so-called "trigger jobs" often include such work as weakening springs or installing reduced power springs, which can take away the extra margin makers build into their guns to deal with adverse conditions like dirt or cold.
Jim
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