Got any statistics to back that up? I mean, it’s anecdotal, but how many school shootings have there been in the USA vs any non gun owning nation? Last one in the UK was Dunblane - and then they banned guns.
The vast majority of gun crime is done with handguns, and much of it is already illegal - i.e. felons in possession of guns or people carrying when or where they're not legally allowed to do so.