Friday, have generated controversy ever since the device was created over how they change the way semi-automatic weapons are fired.
In this Oct. 6, 2017 file photo, Senior Sales Staff Mark Warner shows a bump stock installed on an AR-15 rifle at Blue Ridge Arsenal in Chantilly, Va.Typically, semi-automatic weapons can discharge only one bullet per press of the trigger. However, with the bump stock attached, the user can use the motion and energy from the kickback as the weapon slides back and forth and rapidly fires more bullets.
A shooter can keep a finger still as the recoil and bump stock move the trigger back and forth, according to weapons experts.
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