Wait, what? Again, I'm for the way Canada does it. We should have background checks to the extent Canada does. Not sure where this "overly restrictive" schtick is coming from, I said nothing of the sort. They're more restrictive than we are, yes, but they don't do blanket bans on AR-10s/15s for everyone due to them being dangerous in the hands of someone who should have been institutionalized for a case of the crazy-brain.
You can buy AR-10s in Canada. So that conflicts with your ostensible position that we should ban them outright. That's ridiculous. Just get to a Canada position instead, where if the government's satisfied you're not going to go all Lanza with one (and they're refreshing that background check every year or so, checking in on you and doing another family/friends interview) you're fine, and if you can't pass that threshold they'll prohibit you.
Canada's not Australia on guns, generally. They allow most of the stuff we do, there's just a higher bar to entry. Canada's got a pretty common sense position on this stuff - that's not far enough for what you're calling for though, clearly you're on the "ban ban ban!" train.