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TypeSubmachine gun
Place of originFrance
Service history
In servicenever
Production history
DesignerLouis Debuit
Designedlate 1940s – early 1950s
Mass2.53 kilograms (5.6 lb) (unloaded)
  • 659 mm (25.9 in) stock extended
  • 359 mm (14.1 in) stock collapsed
Barrel length213 mm (8.4 in)

Cartridge9 mm Parabellum, 7.65 mm Longue
Barrels213 millimetres (8.4 in)
ActionDelayed blowback
Rate of fire750 rpm
Effective firing range100 metres (110 yd)
Feed system32-round box magazine (MP-40 compatible)
SightsIron sights

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.[1] 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.[2] 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, but there is no known record of it being purchased or deployed by any military or police force.[2]

See also


  1. ^ McCollum, Ian (May 23, 2017). "MGD PM9 Rotary-Action Submachine Gun". Forgotten Weapons.
  2. ^ a b Popenker, Maxim (October 27, 2010). "MGD PM-9". Modern Firearms.
External images
MGD PM-9 submachine gun
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