FILE - In this Dec. 27, 2012, file photo, a variety of military-style semi-automatic rifles obtained during a buy back program are displayed at Los Angeles police headquarters. Gov. Jerry Brown signed six stringent gun-control measures Friday, July 1, 2016, that will require people to turn in high-capacity magazines and require background checks for ammunition sales, as California Democrats seek to strengthen gun laws that are already among the strictest in the nation. (AP Photo/Damian Dovarganes, File)

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