Quote:
legal serial number is on the frame.
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That is not a hard fast rule: For example, the "legal" serial number on a Ruger Standard .22 pistol is on the upper receiver, not the frame. Likewise, while the serial number of a typical AR15 is on the lower ("frame"), the "legal" s/n is on the upper receiver on a FAL.
I would like to know what kind of weapon the OP is talking about; Is it possible that it is a 1911 frame which would have the "legal" serial, but has a GI replacement slide with a Federal Stock Number?