After rereading, it appears the OP wants to change the dimensions of the stamped NFA gun. I thought the serial # had to match the paperwork. If this is true then a new NFA gun would be created. Does having a stamp mean you could keep making additional guns? It sounds too easy to be true. I suggest the OP ask BATF in writing. The rules were created before we had erector style upper/lower guns. Can we have one stamped S/N lower and a dozen different barrel combos? Elvis: … “it all just seems like a great big fairytale”.
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