Shooting instructor Frankie McRae illustrates the grip on an AR-15 rifle fitted with a "bump stock" at his 37 PSR Gun Club in Bunnlevel, N.C., on Wednesday, Oct. 4, 2017. The stock uses the recoil of the semiautomatic rifle to let the finger "bump" the trigger, making it different from a fully automatic machine gun, which are illegal for most civilians to own. (AP Photo/Allen G. Breed) **FILE**
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