We had all the accusations about Australia since 1996 and Port Arthur. It was at the time the worst mass shooting in the world in modern times. Since the gun control laws introduced we've had no mass shootings in 20 years to date.
BTW the gun nut talks a lot about many of the gun deaths in the US are suicides, then reckons people will kill themselves without guns. Suicide rates went down after gun control laws were bought in here (note above image).