An apparatus known as a self-illuminating light-emitting firearm magazine indicator, or simply, light-emitting magazine indicator, (LEMI), is described here forth. The light-emitting firearm magazine indicator makes use of a self-illuminating device. The device and/or materials could comprise: radioactive gaseous isotopes, self-illuminating paint or any other substance that contains self-luminous properties. The light-emitting firearm magazine indicator will make use of any form of self-illumination technology that require no external power source or battery technology in order to give off light emissions. The light-emitting firearm magazine indicator will use the properties of radio-luminescence as a primary, but not exclusive source to create such attributes. The light-emitting firearm magazine indicator will do the above in order to provide a visual indication of magazine contents or capacity of ammunition in low light to zero light conditions, where firearm magazine contents or capacity of ammunition would otherwise be visually imperceptible without the use of said self-luminous device or the use of an external light source.