To anyone wondering, to save you some googling: yes, both the mentioned instances aren’t obviously-unreasonable in context. One was someone formally asking the ATF whether it’d be illegal if they made a machine gun with a shoe string, and would that shoe string then be an illegal machine gun part and the ATF going “yeah, duh” and the other was someone seeing exactly how close they could get to selling machine gun conversion parts without crossing the line, and the karmic principle of FAFO kicked in.