This video analyzes the MGD PM9, a unique rotary-action submachine gun designed by Louis Debuit for Merlin and Gerin in the late 1940s and early 1950s. The design aimed for compactness, featuring a short action, folding stock, and folding magazine. Its delayed blowback system utilizes a rotating flywheel and clock spring, allowing for a smaller profile. Initially chambered in 7.65 French Long, it was later adapted to 9mm Parabellum and used MP38/MP40 magazines. Despite production in France and licensing attempts by Erma, the PM9 did not achieve commercial success. The video details its mechanics and historical context.
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