In this Aug. 15, 2012 file photo, three variations of the AR-15 assault rifle are displayed at the California Department of Justice in Sacramento, Calif. Omar Mateen used an AR-15 that he purchased legally when he killed 49 people in an Orlando nightclub over the weekend President Barack Obama and other gun control advocates have repeatedly called for reinstating a federal ban on semi-automatic assault weapons that expired in 2004, but have been thwarted by Republicans in Congress.
In this Aug. 15, 2012 file photo, three variations of the AR-15 assault rifle are displayed at the California Department of Justice in Sacramento, Calif. Omar Mateen used an AR-15 that he purchased legally when he killed 49 people in an Orlando nightclub over the weekend President Barack Obama and other gun control advocates have repeatedly called for reinstating a federal ban on semi-automatic assault weapons that expired in 2004, but have been thwarted by Republicans in Congress. Rich Pedroncelli AP
In this Aug. 15, 2012 file photo, three variations of the AR-15 assault rifle are displayed at the California Department of Justice in Sacramento, Calif. Omar Mateen used an AR-15 that he purchased legally when he killed 49 people in an Orlando nightclub over the weekend President Barack Obama and other gun control advocates have repeatedly called for reinstating a federal ban on semi-automatic assault weapons that expired in 2004, but have been thwarted by Republicans in Congress. Rich Pedroncelli AP

How U.S. feeds mass murder

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