As I have said, why would any restrictions on legal firearm owners reduce the illegal killings?
350,000,000 firearms - 30,000 deaths, INCLUDING accidents, suicides, and those "justified" killings as well as the illegal ones. Get rid of the 300,000,000 legal ones, and the number of deaths would INCREASE.

And there has been NO discussion of how to collect those 50,000,000 being held illegally. You want to have the Fergusson Police going through houses looking for illegal weapons? How many killings would that cause?