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Heckler & Koch P11

The Heckler & Koch P11 is an underwater firearm developed in 1976 by Heckler & Koch. It is loaded using a pepper-box-like assembly, containing five sealed barrels each containing an electrically-fired projectile. Wikipedia
Caliber: 7.62 mm
Cartridge: 7.62×36mm, about 100 millimetres (3.9 in) long, miniature solid-fuelled rocket with fins
Effective firing range: 30 metres (98 ft) in air, 10 to 15 metres (33 to 49 ft) underwater
Length: 200 millimetres (7.9 in)
Place of origin: Germany