The hunters I know, they know about AR-15s. They just don't have any desire to have them or use them for their hunting. I'd suggest that over the years, the situation in Canada (e.g. crime rates, attitude about weapons) coupled with our gun control rules and laws, all of that has resulted in the Canadian mindset evolving differently than the American mindset. Personally, I'm quite content in where Canadian mindsets have evolved. Probably also plays a role in the fact that we don't have as much per population crime and violence and mass shootings as in the US. Hey, if Americans want to flash out AR-15s and the like to go hunting duck, goose, deer, etc, I guess that's a US thing and right. Seems kind of silly to me, as silly as all the people who own super sports cars that are capable of tremendous speeds, but they never really get to make use of such due to the road and highway speed limits and rules. Or, as silly as the proliferation of pickup trucks in North America, where most people are basically only using them as cars.
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Why silly? What does AR style rifle do any differently than an "in your mind regular" hunting rifle?
Same thing with pickups. I have big SUVs and trailers when I need to pickup large items. There's been a couple of times where it would be easier to have a pickup than hitch up a trailer. An F150 is no bigger than my Expedition and can hold 5-6 people in a similar configuration.
Small vehicles are great if you're a couple without kids and never have to pickup family or friends to go anywhere.