I'm not a fan of Toronto Sun, but this one is spot on:
The AR-15 rifle that he continues to reference has no history as a crime gun in Canada. I’ve found one instance of this gun being used in a crime in the more than 50 years that the gun has been legal in Canada.
I'm not a fan of AR-15 either. They are already classified as restricted, so I can't take them for target practice in nature. They are also loud as hell at the indoor range and the ammunition is not cheap enough for me to practice enough. However, all this talk of banning makes me want to buy one just in spite.