If, perchance, you are concerned about buying a used gun, you can have a licensed gunsmith look it over to check for modifications or damage, and even have the metal parts magnifluxed to look for any microfractures that would otherwise go unnoticed. It's not too different from what you'd do with a stripped down engine block before building a performance engine, really. Make sure the parts that will see high pressures are solid all the way through.
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