The Bergmann Mars 1903 is a significant early automatic pistol featuring Louis Schmeisser's innovative vertical locking block system, originally designed for machine guns. This allowed for the more powerful 9mm Bergmann cartridge, later adopted as the 9mm Largo by Spain. Despite initial military trial failures in Britain and the US, Spain adopted the Mars 1903 for its simplicity and clip/magazine loading capability, though production faced challenges.
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