Abstract: A universal firearm disabling and alarm signalling system is attained by providing a construction which is easily mounted to any firearm to prevent its unwanted use while also incorporating an automatic alarm signal which is immediately activated whenever the protected firearm is accessed by unauthorized persons. By employing the present invention, any movement of the firearm, or attempt to remove the disabling and alarm signalling system of the present invention from the firearm, causes an alarm signal to be continuously generated, preventing any unauthorized or unwanted use of the firearm. In the preferred embodiment, the universal, combined firearm disabling and alarm system of the present invention incorporates lock means cooperatively associated with the alarm signal generator which is quickly and easily mounted to any desired firearm for preventing unwanted use of the firearm and remains in secure locked interengagement therewith until disengaged by the user.