The P11 use of steel darts was common practice for underwater weapons as standard, land-based cartridges were found to perform poorly when fired in water. The darts were officially of 7.62x36mm Special caliber and held an underwater range up to 50 feet. If pressed, the weapon could also fire above water (though with reduced accuracy) up to a range of 100 feet. Sights were fitted to the weapon to provide for some accuracy at range. Once expended the weapon's entire five-barrel module was simply replaced. The module barrels themselves were only reloadable at the HK factory.
Beyond its use by German special forces (GSG-9), the P11 went on to see adoption by various other nations including Denmark, France, Israel, Italy (COMSUBIN), Malaysia (PASKAL), Netherlands, Norway, the United Kingdom (Special Boat Service), and the United States (Navy SEALs).
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