The pistol can be given to ATF and they will take the gun and deterime the guns status if possible. If not on a current stolen list, it may well be returned to the owner with a new serial number on it. I have seen a Germanicon WWII PPK that had the serial ground off. The ATF put a new serial on the inside of the frame, so as not to further deface the pistol. But you may lose the gun if ATF finds something they don't like about it.
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