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When building a SBR on a form 1 you must list a caliber on the application. My question is can I use a lower reciever that is marked "multi cal" or does the lower have to be engraved with the specific caliber you are going to put on the paperwork? Also, can you list multiple calibers on the paperwork or must you pick just one? I am new to this whole NFA game and trying to figure out the details. Thanks