Something I haven't seen anyone say yet I'd like to point out (although ~Lexi247 said something quite relevant), the estimated number of firearms in the US as of 2007 according to gunpolicy.org ([link]) is 270,000,000. Banning firearms is NOT going to make 270 million guns dissapear overnight. (Just speculation) It would likely take decades to round up all of them, and in the meantime, shootings would still be happening left and right, and probably more so with many people inraged by full gun control.
... And with that said, I'm not even mentioning my side cause dA politics is just mostly full of endless flame
Actually, it is. Fully automatic rifles have been effectively banned since I think the 1980s, and the few that are still around have become RIDICULOUSLY expensive. Really, only collectors have them nowadays.