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. Two styles of barrel assembly can be used: one containing five 7.62×36mm flechette darts for use underwater, or five 133-grain bullets for use above water.

HK P11
OS P11
TypeUnderwater Pistol
Place of originGermany
Service history
In service1977–present
Used bysee Users
Production history
Designed1970s
ManufacturerHeckler & Koch
Produced1976
Specifications
Mass1,200 grams (42 oz) loaded
Battery pack 700 grams (25 oz)
Length200 millimetres (7.9 in)
Width60 millimetres (2.4 in)

Cartridge7.62×36mm, about 100 millimetres (3.9 in) long, miniature solid-fuelled rocket with fins
Caliber7.62 mm
ActionElectric actuated
Effective firing range30 metres (98 ft) in air,
10 to 15 metres (33 to 49 ft) underwater
Feed system5 rounds, each in a barrel
Sights14.6 centimetres (5.7 in) between sights
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