The Seattle Times

ALLEN BREED / AP
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Friday, February 8, 2013

Add-on stock lets semi-autos fire like military weapons

An employee of North Raleigh Guns in North Carolina demonstrates how a "bump" stock works. A "support step" attached to the pistol grip partially covers the trigger opening, preventing trigger contact with the finger. By holding the pistol grip with one hand and pushing forward on the barrel with the other, the finger comes in contact with the trigger. The recoil causes the gun to buck back and forth, "bumping" the trigger.