Hello; Folks do hunt with the AR type rifle. No notion of how many, but more than a few. This platform has many available accessories making it adaptable to many uses. It is also available in a few calibers and ammo types, many of which are suitable for game. I recently got a notice to rerport feral hogs here in my area of Tennessee. Tha AR platform is reported to be a good one for these destructive pests.
Hello; If you buy from a legally lisensed dealer (with a FFL) you will have to go thru the same background check application at a gun show as in a store. There are often private citizens who come to these shows with a firearms they are willing to trade or sell to each other. This would be similar to any private sale anywhere At least so far. Folks buy, trade or sell personal property often and this is still legal.
Hello; A likely issues with no fly -no buy will be a lot of people winding up on these lists that should not be. It is my undeerstanding these lists are not open to the public. I also have heard that folks wrongly on such lists have a very hard time getting such issues cleared up.
Another likely result is that all semi-autos will be lumped together. For example the ruger 10-22 is also banned in australia silmly because it is a semi-auto.