This piece of plastic can turn almost any gun into a machine gun

They are the size of a Lego, come in colors of the rainbow and, in seconds, can turn a semi-automatic weapon into a machine gun. CNN’s Drew Griffin reports on the illegal conversion devices, called auto sears or switches.They are the size of a Lego, come in colors of the rainbow and, in seconds, can turn a semi-automatic weapon into a machine gun. CNN’s Drew Griffin reports on the illegal conversion devices, called auto sears or switches.