A look at military-style semiautomatic rifles

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File-In this Thursday, July 26, 2012 file photo an AR-15 style rifle is displayed at the Firing-Line indoor range and gun shop, in Aurora, Colo. Similar weapons have been used in at least four high-profile shootings in the past year, including most recently the Connecticut school shootings and the Christmas Eve killings of two New York firefighters. (AP Photo/Alex Brandon, File) Photo by
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