Liberals reverse course on mandatory assault-rifle buyback program, opting to make it voluntary Bookmark Please log in to listen to this story. Also available in French and Mandarin. Log In Create Free Account Getting audio file ... This translation has been automatically generated and has not been verified for accuracy. Full Disclaimer A couple pays their respects at a roadblock in Portapique, N.S., on April 22, 2020. The tiny community in rural Nova Scotia was torn apart by the worst mass murder in modern Canadian history, in which the gunman used two semi-automatic rifles, including a Ruger Mini-14. Andrew Vaughan/The Canadian Press