Abstract: The invention relates to portable fire arms intended for use by civil persons for self-defense by shooting with traumatizing elements or by audio and light signals (shot flash). The invention is characterized by a construction of the gun tubes which are embodied in the form of a cartridge case equipped with an electric spark igniter. The inventive arm comprises a bullet holder and an activating mechanism. Said activating mechanism comprises a pulse magneto electric or a pulse electrochemical current supply electrically connected to a distributor provided with a contact block. The embodiment of the gun tube in the form of a cartridge case equipped with electric spark ignitor and the use of the current supply for activating the arm makes it possible to create an effective self-defense arm and to exclude a criminal use thereof.