The Sten MkII, developed by Harold Turpin, was a simplified and more compact submachine gun designed for paratroopers and resistance groups. Key innovations included a quick-removable barrel, a rotating magazine well for flat packing, and a simplified stock for ease of manufacture. Despite its basic appearance, the MkII was produced in vast numbers, with approximately 2.6 million units made, making it the most common Sten variant.
The Sten MkI and MkI* submachine guns were developed rapidly during WWII to meet British military needs for a cheap, easily produced firearm. The MkI featured a wooden handguard and grip, while the MkI* simplified this with stamped metal. Both operated via simple blowback from an open bolt, firing 9mm Parabellum.
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