A further simplification of the STEN design, the Mark III uses a one-piece receiver/shroud assembly, non-detachable barrel, and a fixed position riveted magazine well. While lighter and simpler, the Mark III was harder to repair; damage that would temporarily sideline a Mark II could be fatal to a Mark III. Production was discontinued in 1943. Blade front and peep rear sights on the integral receiver rib, with the model markings and serial number on the magazine well, an "A" and "R" marked selector switch on the trigger housing, tan canvas sling and a tubular buttstock with integral grip.

Very good, with 75% of the black painted enamel finish, showing light wear and flaking overall. The stock shows more of a flat parkerized color, with a similar level of wear. Mechanically very good. NOTE: This weapon is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) that is classified as a "Curios or Relic" as defined in 27 CFR, 478.11. These weapons are still subject to the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 478.