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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. STEN is an acronym, from the names of the weapon's chief designers, Major Reginald V. '''S'''hepherd and Harold '''T'''urpin, and EN for '''En'''field. Over four million Stens in various versions were made in the 1940s. 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.<ref name= "wiki">[[wikipedia:Sten|Wikipedia entry of Sten MKII]]</ref>
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