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SP-4
The SP-4 (СП-4) is Soviet-era developed, Russian Federation, percussion-primed, bottle-necked, captive-piston, pistol round, which is also used in less conventional firearms (see 'Usage' area). The SP-4 was designed to be a low-noise and flashless round, which is designed to provide a ballistic performance near that of a 9×18 round when fired in a Makarov pistol (Пистолет Макарова). History and Development According to Russian source mat...
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