An AR-15 rifle is displayed on top of a booth on the exhibit floor during the National Rifle Association (NRA) annual meeting in Louisville, Kentucky, U.S., on Friday, May 20, 2016. The nation's largest gun lobby, the NRA has been a political force in elections since at least 1994, turning out its supporters for candidates who back expanding access to guns. Photographer: Luke Sharrett/Bloomberg via Getty Images
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