Within a week of the massacre at two mosques in Christchurch, New Zealand, that left 50 dead, Prime Minister Jacinda Ardern announced that the country had banned so-called assault rifles and established a national government buyback program to take those particular firearms off the streets.

“I strongly believe that the vast majority of legitimate gun owners in New Zealand will understand that these moves are in the national interest, and will take these changes in their stride,” Ardern said on Thursday. “What we’re banning today are the things that were used in last Friday’s attack.”