I understand the butt numbers are the correct numbers, but 1) if there were any, and the old stocks were in poor condition, but is it a possible guess that in "messing" with the old stocks, the Serial numbers may have been compromised during the stock replacement with the old stocks that may have somehow made the serial numbers go away? Grinder, Dremel, alcohol, etc.? The gun went to someone who cleaned up the gun's innards and put some different stocks on the gun, so if he/she had those capabilities, would they not have suggested, or brought to the attention of Bellemed? My M&P 38, shipped postwar, has serial numbers on the back of the cylinder, too, and perhaps elsewhere. If so, would those numbers be illegal, also? I have an older 20 gauge pump shotgun with no numbers anywhere, so maybe that "any gun shipped before '68 law" requiring the serial number only pertains to long guns?
And, Bellemed, welcome to the Forum! Do you plan to hang out for a while? Hope so. Lots of information in this joint!! If you think you'd like to hang around, please consider becoming a contributing donor. At the very least, you get rid of ads popping up on the side of the page. At the top of the page is a link for Donations. If you have any issues, cash or personal, you're still welcome!
Peace, Jeff T., Pittsburgh