Hi Bart,
As most of us know, the legal/illegal issue is nothing but a red herring - the real issues are the gun laws and availability of weaponry, particularly military grade weaponry. Japan, with the lowest gun homicides, is a country where ' As of 2011, legal gun ownership stood at 271,000, according to police records, in a country of 127 million people.' The USA, unsurprisingly, doesn't compare favourably.
Manoli