Re: But...but
Though I agree with your sardonic sentiment, the Second Amendment does clearly state "regulated militia" so yes, the FAA could in fact ban these in the same way you can't own a nuclear bomb or automatic firearms made after 1986. So long as you don't ban all firearms in general or create regulations that essentially prevents individuals from owning firearms you're allowed to regulate to a largely undefined and mercurial extent (2008's DC vs. Heller) but IANAL.