The crossword solution for the term 'Antique Weapon' is STEN, a four-letter word. The STEN was a family of British submachine guns that were used during World War II and the Korean War. It was developed in 1941 and was designed to be cheap and easy to manufacture. The STEN was made from stamped steel and was capable of firing up to 500 rounds per minute. It was an effective weapon and was widely used by British forces during the war.