MGD PM-9
Encyclopedia
MGD PM-9 was a French submachine gun, designed during late 40s - early 50s by Louis Debuit. A delayed blowback weapon, firing from an open bolt
, it featured a highly unusual rotating flywheel
as a delaying mass for its bolt. The design never made it to serial production.
Open bolt
A semi or full automatic firearm is said to fire from an open bolt if, when ready to fire, the bolt and working parts are held to the rear. When the trigger is pulled the bolt goes forward, feeding a round from the magazine into the chamber and firing it...
, it featured a highly unusual rotating flywheel
Flywheel
A flywheel is a rotating mechanical device that is used to store rotational energy. Flywheels have a significant moment of inertia, and thus resist changes in rotational speed. The amount of energy stored in a flywheel is proportional to the square of its rotational speed...
as a delaying mass for its bolt. The design never made it to serial production.