You people don't listen. Bans like this have been tried. NOTHING changed. This is not going to solve the problem.
The handgun ban in Washington DC (called the murder capital at the time) caused a 25% drop in the homicide by gun rate and about the same in the suicide by gun rate. Homicide and suicide rates by means other than guns remained relatively unchanged during the same period.
Not only did the ban work, it also put paid to the NRA's argument that murderers would simply choose another method to kill.