The 4.5x40mmR (AKA: 4.5x50mm SPP-1, 4.5mm Spetsialnyj Podvodnyj) is a Center Fire cartridge with a Bullet Diameter of 0.167 in” (4.24mm) that is primarily used in Pistols. The 4.5x40mmR originated in Austria-Hungary in 1920. The 4.5x40mmR also has a case length of 0.404 in” (10.26mm) and an overall length of 0.587 in” (14.91mm).
The 4.5x40mmR pistol cartridge is a unique underwater pistol cartridge developed in the Soviet Union for the Russian Navy Special Forces in the SPP-1 Underwater Pistol. The cartridge is an odd looking spear type pistol cartridge that is completely sealed for underwater use. The 4.5x40mmR underwater pistol cartridge features a 4″ long needle type projectile, fired from a short rifle sized casing (roughly the size of .223 Remington
Because of their application, the 4.5x40mmR underwater pistol cartridges can only be fired single shot from a before reloading. Because of this, many of the firearms for this cartridge such as the SPP-1Underwater Pistol feature 4 barrels in a 2×2 configuration and use clips for reloading, much like a revolver.
SPP-1 Underwater Pistol, HK P11 Scuba Sniper, Type QSS05 Under Water Pistol, SPP-1M
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