'Safety bullet' invention aims to prevent accidental shootings A Florida man claims to have designed a safety bullet which locks up a gun when it's accidentally fired. Mike Worley says his simple invention takes gun safety to another level. He came up with the idea after a local boy was shot in his elbow while showing off his dad's .357 Magnum. The safety bullet can be hidden in the gun chamber and ejected quickly if the owner needs to fire a live bullet. If the safety bullet is fired, it jams the chamber and locks the gun until the shell...