MGD PM-9
The MGD PM-9 was a French open bolt submachine gun, designed in the late 1940s or early 1950s by Louis Debuit and manufactured in small numbers by French firm Merlin and Gerin in the 1950s. The PM9 was an unusual design in three different ways: It employed off-axis delayed blowback, it had a clock-style spiral mainspring similar to that of the Lewis gun, rather than the cylindrically coiled spring used in the vast majority of self-loading firearms and, most unconventionally of all, used a rotating flywheel as a delaying mass in conjunction with the bolt. It was furnished with a folding magazine, and some also had folding buttstocks, and this together with its original operating mechanism results in a highly compact weapon.
MGD PM-9
L. Debuit · US Patent 2,843,023 · Public domain
- Name
- MGD PM-9
- Field
- submachine gun
- Region
- France
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Documentary summary
The MGD PM-9 was a French open bolt submachine gun, designed in the late 1940s or early 1950s by Louis Debuit and manufactured in small numbers by French firm Merlin and Gerin in the 1950s. The PM9 was an unusual design in three different ways: It employed off-axis delayed blowback, it had a clock-style spiral mainspring similar to that of the Lewis gun, rather than the cylindrically coiled spring used in the vast majority of self-loading firearms and, most unconventionally of all, used a rotating flywheel as a delaying mass in conjunction with the bolt. It was furnished with a folding magazine, and some also had folding buttstocks, and this together with its original operating mechanism results in a highly compact weapon.
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wikidata · Q6715715 · wikipedia · MGD PM-9
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There is no known record of it being purchased or deployed by any military or police force.
Key facts
Key facts
• Name — MGD PM-9 • Origin — France • Type — Submachine gun • Is Ranged — yes • Service — never • Designer — Louis Debuit • Design Date — late 1940s – early 1950s • Weight — 2.53 kg (unloaded) • Length — * 659 mm stock extended • 359 mm stock collapsed • Part Length — 213 mm • Cartridge — 9 mm Parabellum, 7.65 mm Longue • Barrels — 213 mm • Action — Delayed blowback • Rate — 750 rpm • Range — 100 m • Feed — 32-round box magazine (MP 40 compatible) • Sights — Iron sights
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- France
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MGD PM-9 is associated with France.
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reference work
- “MGD PM-9”, English Wikipedia, consulted as further reading
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authority record
- Wikidata, structured authority record Q6715715: MGD PM-9
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1- submachine gunTerminology
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The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 14 August 2026.
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