Interesting.
It's only "required" on the lower. If I read that right. Used ones can be picked up with no stamp on anything but the lower. Of course those are long numbers.
IF chose or described
city or state ? Ok.
If the barrel has the caliber is it required in the "serial" number on the 80?
man's name, John.
your 80% lower, frame, or receiver's markings must:
Notice the OR . That would mean one of the following. Not all which would be an AND.