Abstract: A stun grenade for repelling or defending against threats, and to a method for assembling the stun grenade. For this purpose, the main bodies of the stun grenades are produced separately from the flash charge containers. The flash charge containers are designed as at least one container for this purpose, which can be filled with at least one effect charge via an opening. The flash charge containers are then closed water-tight. The main bodies of the stun grenades can likewise be produced separately and comprise at least one cut-out for inserting the flash charge containers into the stun grenade. Thus, in case of use, the stun grenades can be assembled by mounting at least one flash charge container in the main body.