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The SPP-1 Underwater Pistol was made in the USSR for use underwater by Soviet frogmen as an underwater firearm.〔Popenker, Max R. "(SPP-1 underwater pistol )", ''world.guns.ru'', Retrieved 2010-04-05''〕 It was developed in the late 1960s and accepted for use in 1971. Underwater, ordinary-shaped bullets are inaccurate and very short-range. As a result, this pistol fires a round-based caliber steel dart about long, weighing , which has longer range and more penetrating power than speargun spears. The complete cartridge is long and weighs .〔 “( 4.5-mm SPS underwater fire cartridge )”, ''Tsniitochmash'', Retrieved 2010-04-05''〕 ==Design== The SPP-1 has four barrels, each containing one cartridge. Its ammunition comes as a magazine of four cartridges which is inserted into the pistol's breech.〔 Its barrel is not rifled; the fired projectile is kept in line by hydrodynamic effects. As a result, it is somewhat inaccurate when fired out of water.〔”(Firearms Technical Trivia )”, ''cruffler.com'', November 2001, Retrieved 2010-04-05〕 A double-action firing mechanism fires one cartridge sequentially for each pull of the trigger. When all four cartridges are spent, the gun can be reloaded above or below water.〔 The SPP-1M pistol is essentially the same as the SPP-1, with the following differences:〔 “( SPP-1 and SPP-1M underwater pistol 4.5mm )”, ''www.securityarms.com'', Retrieved 2010-04-05''〕 * It has an extra spring above the sear to improve the trigger pull. * Its trigger guard is larger to accommodate diving gloves. The weapon was designed by Vladimir Simonov, the cartridge by Pyotr Sazonov and Oleg Kravchenko.〔 Simonov also designed the APS amphibious rifle.〔Popenker, Max R. "(APS underwater assault rifle (5.6x39 mm MPS) )", ''world.guns.ru'', Retrieved 2010-04-05〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「SPP-1 underwater pistol」の詳細全文を読む スポンサード リンク
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