Regulation. We already have some (can't buy a tank without going through QUITE a long process), and the Second Amendment calls for "a WELL-REGULATED militia". It's not a question of whether there should be regulations, but what those regulations should be.
It's just going to take guns out of law abiding citizen's and leave only the criminals with them. I don't think it's right for someone else to tell me what I'm allowed to own in my home. They need to mind there home and not mine.