Automatic weapons are illegal everywhere, so I don't know why you've mentioned them.

Large magazines?; I agree with you if you're talking about the kind of clip this sociopath in Colorado was in possession of. There is no reason on God's green earth for a citizen to own a 100 round drum clip. The military doesn't even use such equipment.

In NYC there is, or used to be, a ban on magazines that hold more than 10 rounds. Second Amendment advocates denounced those restrictions. I'm not sure of the efficacy of such a law.

Actually they aren't, but you need a special permet to own them.

I was always under the impression that they were illegal for private citizens to own, but I see that you can own them with a special Class III permit in most states.

You learn something new every day.