At the same time the higher the bore pressure, the greater is the resistance, meaning that the high-power cartridge generates the required bore unlocking delay. When a shot is fired, the cartridge case walls are pressed into the grooves by the powder gas pressure - this increases the resistance to the cartridge case's backward motion, while preventing it from a cross break. Three spiral grooves on the chamber wails enabled the PMM pistol lo fire both the high-power and standard cartridges. A smooth transition of the double-column magazine into a single-column neck allowed designers not to modify the magazine cavity and the slide. Magazines with a capacity of over ten rounds are typical of modern combat pistols. The PMM can be fitted with a single-column 8-round magazine or a double-column 12-cartridge magazine (the variants are designated PMM-8 and PMM-12, respectively).
The pistol has been in production at Izhevsk Mechanical Plant since 1994.Įxternally, the PMM differs from the baseline Makarov PM in a larger notched pistol grip to ensure greater stability during a shot. Shigapov developed the upgraded Makarov PMM pistol (56-A-125M) chambered for the new round.
The new shape of the bullet weighing 5.54 g (as against 6.0 g for the old bullet) and a higher muzzle velocity (420 m/s) combined to ensure belter ballistics, higher penetration, and lower ricochet probability. The Makarov PMM updated self-loading pistolīy the late 1980s, a mismatch between the capabilities of the in-service pistol system and the changed conditions for operational of side arms - a wide use of body armor required increased penetration and better accuracy of fire - had become evident, in the early 1990s a PM pistol derivative0 chambered for a new 9x18 PMM high-power cartridge, was proposed for a competition for a new army pistol.
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