We don’t use piercing guns for several reason. The first and most important is that they can be a source of infection transmission. Piercing guns get a certain amount of blood and other body fluids on them during a piercing. As they are generally made of plastic they cannot be sterilized since they would melt. […]
The Association of Professional Piercers (APP) is an international health and safety organization dedicated to disseminating information about body piercing. You can read more here. Even non-piercers can help the organization by becoming Patron Members.