In this July 20, 2012, file photo, a row of different AR-15 style rifles are displayed for sale at the Firing-Line indoor range and gun shop in Aurora, Colo. Tega Cay is acquiring another type of assault rifle, the M4, to arm its police force.
In this July 20, 2012, file photo, a row of different AR-15 style rifles are displayed for sale at the Firing-Line indoor range and gun shop in Aurora, Colo. Tega Cay is acquiring another type of assault rifle, the M4, to arm its police force. Alex Brandon AP
In this July 20, 2012, file photo, a row of different AR-15 style rifles are displayed for sale at the Firing-Line indoor range and gun shop in Aurora, Colo. Tega Cay is acquiring another type of assault rifle, the M4, to arm its police force. Alex Brandon AP