In this Feb. 1, 2013 photo, an employee of North Raleigh Guns demonstrates how a "bump" stock works at the Raleigh, N.C., shop. The accessory devices, which legally allow a semiautomatic rifle to fire like a real machine gun, are among nearly 160 weapons or accessories targeted by a proposed federal ban. (AP Photo/Allen Breed)

Associated Press
In this Feb. 1, 2013 photo, an employee of North Raleigh Guns demonstrates how a "bump" stock works at the Raleigh, N.C., shop. The accessory devices, which legally allow a semiautomatic rifle to fire like a real machine gun, are among nearly 160 weapons or accessories targeted by a proposed federal ban. (AP Photo/Allen Breed)
In this Feb. 1, 2013 photo, an employee of North Raleigh Guns demonstrates how a "bump" stock works at the Raleigh, N.C., shop. The accessory devices, which legally allow a semiautomatic rifle to fire like a real machine gun, are among nearly 160 weapons or accessories targeted by a proposed federal ban. (AP Photo/Allen Breed)
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