It's really a situation where you are probably better off doing nothing other than shooting the gun with proper shells.
A gunsmith won't be able to do much unless he disassembles the gun...and when he does that he'd better be a top-shelf gunsmith of he'll do more damage than good. Every time a Parker's screws get turned something is lost.
Then again...if you are concerned still I'd recommend finding a guy who can measure the wall thickness of the barrels. That's probably the one area where an unknown gun could have an issue that is hidden to the naked eye.
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