The present invention discloses a firearms safety system for adapting conventional handheld firearms to fire non-deadly simulated training ammunition, which system provides a series of gas relief ports (144) and passages to prevent the successful firing of live ammunition in the firearm. The system can be advantageously utilized in modified M16 type military type rifles which have been previously adapted to fire pistol cartridges (201) such as the 9mm and .40 S & W calibers. The system is also particularly advantageous for use in handheld firearms such as pistols and revolvers, as well as in conventional long guns such as bolt action rifles, and all shotguns.
