| MGD_PM-9 | |
| Origin: | France |
| Type: | Submachine gun |
| Is Ranged: | yes |
| Service: | never |
| Designer: | Louis Debuit |
| Design Date: | late 1940s – early 1950s |
| Weight: | 2.53kg (05.58lb) (unloaded) |
| Length: |
|
| Part Length: | 213mm |
| Cartridge: | 9 mm Parabellum, 7.65 mm Longue |
| Barrels: | 213mm |
| Action: | Delayed blowback |
| Rate: | 750 rpm |
| Range: | 100m (300feet) |
| Feed: | 32-round box magazine (MP-40 compatible) |
| Sights: | Iron 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]