The STEN gun was a British submachine gun used during World War II. It was a simple and inexpensive weapon that was mass-produced and widely used by British and Commonwealth forces. The STEN gun was designed to be easy to manufacture and maintain, and it was made from stamped metal parts. It was reliable and accurate, and it could fire up to 500 rounds per minute. The STEN gun was a popular choice for British troops during the war, and it was used in many battles.