This gun was made by prisoners at Germany’s Celle Prison in the jail’s own metal workshop. They used steel and match heads for ammunition.
Radio Transmitter/ Bug
Items like this have been used by prisoners as a means to spy on guard rooms in order to keep abreast of upcoming searches or raids. This bug was found in the guard room of Wolfenbüttel Prison in Germany. It can also serve as a form of communication between prisoners.
One of the most compact and effective prison weapons, this was made from string, paper packaging, and a metal rasp presumably stolen from the prison workshop.