How will you divide them--one machine for handguns, one for rifles, and one for shotguns? What about rimfire rifles and handguns?
And what about the ammo? 
Decisions, decisions . . . 
Naw, you've seen those candy machines with all the buttons, A3, B6, F4! Instead of Reese's Peanut Butter cups, or Snickers bars, we could put all the more popular ones in one place! That way we could serve more of the public with the same amount of outlets!
Hafta be pretty big and heavy machines, though. Kinda like ATM's. Never seen a criminal yet get away with one yet and they make regular appearances on "World's DUmbest Criminals"! Makes ya wonder what their DU names are, don't it?