A row of different AR-15 style rifles are displayed for sale at an indoor range and gun shop, in Aurora, Colo. in 2012.
A row of different AR-15 style rifles are displayed for sale at an indoor range and gun shop, in Aurora, Colo. in 2012. Alex Brandon AP
A row of different AR-15 style rifles are displayed for sale at an indoor range and gun shop, in Aurora, Colo. in 2012. Alex Brandon AP