An AR-15 style rifle is displayed at the 7th annual Border Security Expo in Phoenix, Arizona, in this file photo taken March 12, 2013. Wal-Mart Stores Inc, the United States' top seller of guns and ammunition, said on Wednesday it would stop selling the AR-15 and other semi-automatic rifles stores because of sluggish demand and focus instead on “hunting and sportsman firearms”. (Photo by Joshua Lott/Reuters)
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