The most expedient method of removing firearms from those who shouldn’t have them would be to pass federal legislation making confiscation mandatory — as Australia did, following a spate of mass killings that culminated in a 1996 nightclub massacre that took 35 lives. Twelve days later, the nation enacted strict gun reform legislation that limited the types of firearms available to civilians. The government has since collected and destroyed more than a million weapons through buyback and amnesty programs. Over the next 20 years, Australia suffered not a single fatal mass shooting.