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CNBC tells the story of one gun: the nation's most popular and feared firearm, now at the center of a wrenching national debate. The AR-15 is legal and lethal, loved by some and despised by others, assailed and defended, seven pounds of metal and plastic that has become a symbol in the great divide between those who say it belongs only on the battlefield and others who insist owning one is their inalienable right.
