An electronic device for simulating gunfire. The device includes a discharge chamber, a first electrode, and a second electrode. A high voltage circuit may be connected to the first and second electrodes, and may be configured to generate an electrical arc between the first and second electrodes, thereby creating percussive sounds that travel through the opening in the body. Also disclosed are embodiments where multiple discharge chambers are provided to generate electrical arcs in various discharge sequences, as well as embodiments where the device incudes a housing that is shared as a rifle scope or an AR upper barrel assembly.