There's a significant burden of injury from firearms.
Multiple mass shooting events fortunately are uncommon. They still attract media attention and grab the public's attention, as was seen with the 2019 shooting of three people in northern B.C., which resulted in daily frontline headline news and the largest manhunt in recent Canadian history.
They occur about once a year. The majority of them have been associated with either handguns or semi-automatic weapons with large-capacity magazines, the latter resulting in a greater number of casualties per incident.