How gun accessories called bump stocks ended up before the U.S. Supreme Court

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FILE - Shooting instructor Frankie McRae demonstrates the grip on an AR-15 rifle fitted with a "bump stock" at his 37 PSR Gun Club in Bunnlevel, N.C., on Oct. 4, 2017. 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 G. Breed, File)