More than 4 million Sten guns were made during World War II, with the most common version being the Mk II. ... The Mark II had a simple barrel nut that secure the 7 ¾” barrel to the receiver.

Today, the Sten Gun is often remembered for its iconic side-mounted magazine but that was far from revolutionary, as the German MP18/28 and later submachine guns such as the MP34 and Model 1935 ...