ATF agents provide Glock switch danger demonstration

This is a demonstration of use of a Glock switch on a semi-automatic gun at Birmingham Police firing range. Notice the trigger is pulled once. 17 rounds shot in less than 3 seconds. Now imagine an assault weapon with an extended clip with a conversion device on it. This is why we need more laws and stiffer penalties for the manufacturing, selling, possession, and use of conversions devices. | Randall Woodfin

Glock Switch presentation by the ATF

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A tiny and cheap device called a 'Glock switch' lets criminals create their own machine guns