First, the term machine pistol must be defined, to separate these from Personal Defense Weapons and submachine guns. If you consider that it is a handgun designed to fire a pistol cartridge in a fully automatic or burst fire mode, then a likely candidate would be any gun chambered in 10mm (700 ft lbs muzzle energy) followed by the .40 S&W or the .38 Super (500 ft lbs) However, in 1935, Remington made a special .45 ACP cartridge to be fired from the Thompson- and one version of the Thompson IS called a machine pistol- and the .45 Remington-Thompson cartridge was rated at 1,050 ft lbs of energy. Most machine pistols in 9mm Parabellum or 9mm Makarov have much less power.
The most powerful air pistol would be a Air Force Talon-p 25 Caliber. This is a PCP class air pistol. The air tank uses 3000 PSI to fire the pistol.
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Smith and Wesson 500 magnum revolver
United States Military
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The Supermarine Spitfire. No question about that.
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Yes and no. Some submachine guns have a shoulder stock, most machine pistols do not.
Yes. Every officer has a pistol (most 9x19mm) and there is also a machine pistol (most MP5 by HK) in every police car.