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Bump stocks, the firearm modification banned by the federal government until the U.S. Supreme Court struck down the regulation Friday, have generated controversy ever since the device was created over how they change the way semi-automatic weapons are fired.
The modification replaces the back of a semi-automatic rifle, which is usually held up against the shoulder, and allows the weapon to slide back and forth.
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.
