Abstract: The present invention overcomes the limitations of the prior art by providing a stun grenade device with an elongated cylindrical body having a cylindrical sidewall and opposed top and bottom end faces. The body includes a delay chamber containing a delay material, and has a number of flash charge chambers each containing a quantity of flash charge material. The body defines a number of ignition passages, each communicating from a respective flash charge chamber to the delay chamber. Each flash charge chamber has at least one exhaust aperture penetrating the top or bottom end face. Each flash charge chamber may be formed in an elongated tubular sleeve inset in a frame of a different material.