If you have good reason to believe these people will harm someone with their guns, please report it to the RCMP, instead of wishing that their guns were a different colour.
Follow this link and use the contact information to file a report. Please do this immediately if you think someone is in danger of being harmed. https://rcmp.ca/en/firearms/contact-canadian-firearms-program
I agree with you fully on that point.
In my mind, the penalties for being caught with an illegal firearm should be far more severe. It should be a long, mandatory prison sentence. This seems like an obvious first step. I don't see how further restricting legal owners will solve the sorts of problems that we want solved when we think about gun crime.