Ok, I don't mind research, research is good, but why do I feel like the focus is being lost on the issue.
Adam Lanza was 20 years old, a young man, had psychological issues and his mother took him to the shooting range as a way to connect with him. This was clearly a bad mix.
Each major shooting like this in the last 20 years the individuals involved had clearly defined psychological issues, these were not stable people. In most cases they had withdrawn from most social aspects of their lives, and/or had issues that kept them from forming strong social bonds.
The root of this discussion should shift to mental health, detection and treatment, support systems. Guns laws could be further tightened, but his mother was the one that obtained the guns so it would be hard to form a legal structure for testing an entire family when someone wants to own a gun. I believe in Gun ownership but not sure people need high capacity clips nor assault rifles. If a hunter can't take down a deer with the first shot, they are likely going to be tracking the deer for miles to put it down so why would they need 30 in the clip ... usually indicates a hunter that needs to learn how to shoot.
Lastly I have been playing violent video games for years, I am not pricing out rifles to hunt people. I see parents buying M rated games for kids under 17 all the time and they know what they are doing, they know what the M rating means when they buy it they just don't care or don't think its a big deal. So parents need to start being a little bit more considerate with their kids and the content they consume. I am a heavy video game player, I will run through about 3-4 games a month. I do not let my Son play them, he's not old enough yet, just like I wont let him watch rated R movies yet.
I say bring on the research, but don' take your eye off the ball, and in this case the ball is all the topics not just video games.