In 2010, Rick Vasquez, was a senior analyst in the Firearms Technology Branch of the Bureau of Alcohol, Tobacco, and Firearms, when his office reviewed a device sent in by a company called Slide Fire. The device, which is known as a bump stock, helps the body of a semi-automatic rifle slide back and forth during firing, replicating the effect of a machine gun -- a consecutive and rapid spray of bullets. New machine guns have been banned for public sale since the 1980s, but Vasquez's team determined that the bump stock -- a device that can cost as little...
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