Abstract: A plurality of weapons are provided with electrically operated firing devices and radio transmitting and receiving equipment which permits each weapon to be fired only when the weapon trigger is depressed and a specific command signal is received by the weapon. A master control unit permits an operator to select necessary conditions which are to be satisfied before giving the command, including numbers of groups and weapons to be employed and numbers thereof which are to be in firing position with triggers depressed. Switching and logic arrangements are disclosed to permit the selection, receive signals from the weapons, recognize satisfaction of the conditions, and give the command simultaneously to all ready weapons.