The term 'British Gun' refers to two firearms used by the British military during the 20th century. The first is the STEN gun, a submachine gun developed in 1941 and used extensively by British forces during World War II. The second is the BREN gun, a light machine gun developed in 1935 and used by the British Army until the late 1960s. Both weapons were reliable and easy to use, making them popular with British troops.