An employee of North Raleigh Guns demonstrates how a bump stock works at the Raleigh, N.C., on Feb. 1, 2013. Gun accessories known as bump stocks hit the market more than a decade ago. The U.S. government initially concluded that the devices that make semi-automatic weapons fire faster didn't violate a federal ban on machine guns. That changed after a gunman with bump stock-equipped rifles killed 60 people and wounded hundreds in Las Vegas in 2017. (AP Photo/Allen Breed) **FILE**
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