On May 1, 2020, the Canadian government outlawed 1,500 types of semiautomatic rifles, effectively banned handguns by attrition, and announced a firearms buyback program to take possession of the newly-banned guns. The action was the federal government’s response to a mass shooting in Nova Scotia in which 22 people were killed over April 18-19, 2020. The killer, dressed as a Royal Canadian Mounted Police officer and driving a car rigged to look like a patrol car, used an AR-style rifle...