Law abiding citizens, naturally. Prof. John Lott wrote a great book on this very subject "More guns, less crime"
As for the people that say gun control somehow makes it easier to put criminals away longer, that is nonsense. Criminals aren't going to bother registering for their guns, first off. So, the vast majority of them will get their guns off the black market anyway!
And all we need to do to put them away longer if they are carrying a gun is simple. If they are caught breaking the law, any of the typical crimes that gang members commit, then you just say they are not allowed to have possess a fire arm for probationary period, just like they do in many scenarios, like driving for instance. Having some arbitrary gun control law that only hurts law abiding citizens does not affect criminals.

