It's good to see someone write something intelligent on the subject. I'm not sure I go along with the so called assault weapon AR being the weapon of choice for these nut cases. The ft Hood guy although a military member used a pistol as did the Gifford shooter. The columbine shooters used mainly cut off shotguns. Any are affective, so it's the Australian thing, start with one and it works its way down to sling shots.  
What the antis really need to work on is whats driving these people as they will still have their heads screwed on crooked with or without gun restrictions. Anyone can get a gun on the street when the sun goes down, anyone regardless of all the laws on the books. 
And, quit with the gun control threat and general sales slow way down, don't give people a reason to load up.