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For Australia, the NFA seems to have been incredibly successful in terms of lives saved. While 13 gun massacres (the killing of 4 or more people at one time) occurred in Australia in the 18 years before the NFA, resulting in more than one hundred deaths, in the 14 following years (and up to the present), there were no gun massacres.
The NFA also seems to have reduced firearm homicide outside of mass shootings, as well as firearm suicide. In the seven years before the NFA (1989-1995), the average annual firearm suicide death rate per 100,000 was 2.6 (with a yearly range of 2.2 to 2.9); in the seven years after the buyback was fully implemented (1998-2004), the average annual firearm suicide rate was 1.1 (yearly range 0.8 to 1.4). In the seven years before the NFA, the average annual firearm homicide rate per 100,000 was .43 (range .27 to .60) while for the seven years post NFA, the average annual firearm homicide rate was .25 (range .16 to .33)
Additional evidence strongly suggests that the buyback causally reduced firearm deaths. First, the drop in firearm deaths was largest among the type of firearms most affected by the buyback. Second, firearm deaths in states with higher buyback rates per capita fell proportionately more than in states with lower buyback rates.
In other words, the quicker guns were gone, the quicker all firearms deaths dropped.