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Source: CNN Website
Consider what happened in Australia after a crazed gunman killed 35 people in Port Arthur, Tasmania, in 1996.
The Australian federal government persuaded all states and territories to implement tough new gun control laws. Under the National Firearms Agreement (NFA), firearms legislation was tightened throughout the country. National registration of guns was imposed and it became illegal to hold certain long guns that might be used in mass shootings.
The gun ban was backed up by a mandatory buy-back program that substantially reduced gun possession in Australia.
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The effect was that both gun suicides and homicides (as well as total suicides and homicides) fell. Importantly, while there were 13 mass shootings in Australia during the period of 1979--96, there have been none in the sixteen years since.