The Erma EMP, designed by Heinrich Vollmer, was a sophisticated interwar submachine gun funded secretly by the German government. Despite treaty restrictions, Vollmer sold the design to Erma, which marketed it internationally in various calibers and configurations. Key features include a vertical front grip, left-side magazine, a unique police safety mechanism, and a progressive trigger for selectable fire modes. Its innovative telescoping recoil spring design was later adopted by the MP40.
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