To put things into perspective a little bit....
Number of gun homicides per year since mid 80's roughly 13,000
Number of mass shooting homicides per year since mid 80's roughly 16 - only .001% of gun homicides are a result of mass shootings.
That means only about .0005% of gun homicides are committed with an AR.
This is why gun owners are going apeshit over these new laws and proposed changes. There is no AR killing spree trend! Law makers proposing a ban on hand guns at least makes sense if they're really aiming to reduce gun violence. But that's not happening.
Granted this year was a bad year, but it is a spike, not a trend. In 2010 there were 1/4 of the mass shootings that took place in 2009. In 2002 not a single mass shooting took place, but there were large spikes in 1999 and in 2007. Largely because of 2 incidents.
In 2012 there were 500 firearm homicides in Chicago, the same amount of homicides from ALL mass shootings that took place over the last 30 years.
Others have said it before.... if you want to remove gun violence from America, remove America's drug problem.