Well, that didn't work out as we expected

Port Arthur, 20 years on: Australia has more guns than ever:

 From the late 1970s, gun deaths in Australia have trended downwards. The risk of an Australian dying by gunshot remains less than half what it was before Port Arthur. But firearm fatalities have not disappeared. There were 200 gun deaths last year. Around 80 per cent were not a crime, but suicides and accidental deaths.

As for the criminal element, it goes beyond homicide. Gangs, bikies and drug rings typically use handguns for protection and the most common weapon used in attempted murder in 2014 was a firearm. “Most gun homicides are committed by people who know each other well,” said Prof Alpers. “Stranger danger is a lower risk than people realise. “The majority of gun owners are law-abiding people who need them as legitimate tools. As with terrorism, you have to legislate for the minority.” One of the biggest effects of the amnesty, according to Prof Alpers, is that semi-automatic weapons — rapid-fire rifles and shotguns — have been replaced with single-shot firearms ...

Funny; they thought that getting rid of guns would get rid of violence.