Regardless of how convincing you can be that banning them would be a good idea, under what legal framework could they conceivably be banned (at least in the Uni

Regardless of how convincing you can be that banning them would be a good idea, under what legal framework could they conceivably be banned (at least in the United States)? You can literally buy guns just as easily in many places in the United States (granted, guns are more expensive). Maybe the FCC could make try to argue that they have the authority?