Where do the illegal guns used on the street come from? Well, I don't think there are many illegal gun factories, so it's safe to assume they move from legitimate commerce into an illegal market. At some point an illegal gun goes from being under the control of a legitimate owner into the hands of a criminal.

So, it would seem, stopping criminals from getting illegal guns is largely in the hands of legitimate gun owners. Too bad many of them don't see it that way.