I know that some doctors have developed a process for x-raying old decoys to show repairs,the age of paint and other things to determine the originality of the decoy. Perhaps there are some radiologists with an interest in guns that could develop a procedure for shotgun barrels. I guess the cost of some decoys,over 500,000 bucks for some and 5 figures for most "good' ones, has driven the incentive to find a way to detect flaws and faking.Maybe not worth it on a shotgun worth a couple of grand.
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