|Place of origin||Germany|
|Weight||1,200 grams (42 oz) loaded|
Battery pack 700 grams (25 oz)
|Length||200 millimetres (7.9 in)|
|Width||60 millimetres (2.4 in)|
|Cartridge||7.62 x 36 mm, about 100 millimetres (3.9 in) long, miniature solid-fuelled rocket with fins|
|Effective range||30 metres (98 ft) in air,|
10 to 15 metres (33 to 49 ft) underwater
|Feed system||5 rounds, each in a barrel|
|Sights||14.6 centimetres (5.7 in) between sights|
Since ordinary-shaped rounds are inaccurate and have a very short range when used underwater, this pistol fires steel darts about 10 centimetres (3.9 in) long. It has five barrels, each of which is loaded with a cartridge, giving the gun a pepper-box appearance, and it is electrically ignited from a battery pack in the pistol grip. After firing all five cartridges, the barrel unit must be sent back to its manufacturer for reloading. It is very similar to its predecessor, the Mk 1 Underwater Defense Gun. In the past, Heckler & Koch has denied knowledge of its existence.
This firearm is somewhat bulkier than its Soviet counterpart, the SPP-1 Underwater Pistol, but it has five barrels, as opposed to the Soviet firearm which has four. However, the SPP-1 does not need to be sent back to the manufacturer to be reloaded.
- Germany: German commando frogmen.
- Italy: Italian Navy COMSUBIN.
- United Kingdom: Special Boat Service of the British Royal Navy.
- United States: 100 units have been issued to members of U.S. Special operations forces.
- "Heckler & Koch HK P11 Underwater Pistol". Modern Firearms. http://world.guns.ru/handguns/hg209-e.htm. Retrieved 2008-03-29.
- "Underwater Pistol - HK P11". Special Boat Service: Information on the SBS. http://www.specialboatservice.co.uk/sbs-weapons-p11.htm. Retrieved 2008-03-28.
- Dockery, Kevin (2004). Weapons of the Navy SEALs. New York: Berkley. p. 68. ISBN 0-425-19834-0.
- Southby-Tailyour, Ewen (2005). Jane's Special Forces Recognition Guide. New York: Collins. p. 366. ISBN 0-00-718329-1.
- "Straight Dope Staff Report: How far can bullets go when fired into water?". The Straight Dope. Archived from the original on 2008-03-27. http://web.archive.org/web/20080327052050/http://www.straightdope.com/mailbag/mgununderwater.htm. Retrieved 2008-03-28.
- "SBS Weapons - HK P11 Underwater Pistol". Elite UK Forces. http://www.eliteukforces.info/special-boat-service/weapons/p11/. Retrieved 2008-03-28.
- "HKPRO: The HK P11". HKPRO. Archived from the original on 2008-03-07. http://web.archive.org/web/20080307061323/http://www.hkpro.com/peleven.htm. Retrieved 2008-03-28.
- HKPRO: The HK P11
- Securityarms: Heckler & Koch P11 Underwater Pistol
- Modern Firearms: Heckler Koch HK P11 underwater pistol
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