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Just double checking, its the lower thats considered the firearm, right? Since it is serialized and the Upper is not? Im just asking for selling purposes....
In what is probably a small number of cases, both might be. I have a rifle that has two different numbers on the upper and lower. This was created when the importer paired high quality uppers (but poor quality lowers) with good quality lowers (and garbage uppers). That is how it is registered, that is how it will remain. Would make verification a PITA, should it ever happen.