A writer at Breitbart has referenced a study done by Harvard in 2007
debunking the claim that banning firearms would reduce murder or even suicide.
Suicide is the far and away leader in handgun deaths while rifles, including the confusingly-termed 'assault' kind, are barely a blip in murders or suicides, a few hundred per year.
This sort of analysis has been done multiple times and get done each time a shooting tragedy happens. When 'shooting sprees' were blamed on American gun culture last year, it was quickly noted that the rate of shooting sprees in countries where guns are outlawed are not lower.