The UK Carbine is a submachine gun developed by the British during World War II. It is also known as the STEN, which is an acronym for the names of the designers, Major Reginald V. Shepherd and Harold Turpin, and ENfield, the location of the Royal Small Arms Factory where it was manufactured. The STEN was a simple and inexpensive weapon that was easy to produce and maintain, making it a popular choice for British troops.