And I have a nit of my own to point out: the justices’ inconsistency (which for Justice Breyer is an internal inconsistency) on whether “machine gun” is one word or two.
In his majority opinion, Justice Scalia refers to “machineguns” as one word at page 52 of the Court’s opinion. Justice Stevens calls them “machine guns” at page 41 of his dissent.
And Justice Breyer can’t make up his mind. He refers to “machine guns” at page 29 of his dissent, but to a “machinegun” at page 34, and to “machineguns” at page 42.
As to which is proper, I express no opinion. Just pick one and stick with it!