A variety of military-style semi-automatic rifles obtained during a buy back program are displayed at Los Angeles police headquarters on Dec. 27, 2012, in Los Angeles. (AP Photo/Damian Dovarganes, File)
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A variety of military-style semi-automatic rifles obtained during a buy back program are displayed at Los Angeles police headquarters on Dec. 27, 2012, in Los Angeles. (AP Photo/Damian Dovarganes, File)
