Font: Wikipedia (anybody of twelve years old can write all this...:P)
The STEN (or Sten gun) was a family of British submachine guns chambered in 9×19mm and used extensively by British and Commonwealth forces throughout World War II and the Korean War. They were notable for having a simple design and very low production cost making them effective insurgency weapons for resistance groups.
The Mark II was the most common variant, with two million units produced. It was a much rougher weapon than the Mk I. The flash eliminator and the folding handle (the grip) of the Mk I were eliminated. A removable barrel was now provided which projected 3 inches (76 mm) beyond the barrel sleeve. Also, a special catch allowed the magazine to be slid partly out of the magazine housing and the housing rotated 90 degrees counter-clockwise (from the operator's perspective), together covering the ejection opening and allowing the weapon and magazine both to lie flat on its side.
In-Game features
The Sten Mark 2 is an Sub Machine Gun used by the ally faction, It can be attached with a suppressor, The model was created by Beardielover.