During the Cold War, Soviet intelligence was one of the best in the world. We can say with confidence that Soviet intelligence officers shared the palm with American intelligence officers. The equipment and equipment of agents in the Union did not skimp. Including they were not too lazy to spend money on the creation of highly specialized weapons. Just such was the C-4 pistol. What did he represent?
The compact silent pistol S-4 was created during the Cold War specifically for special operations, primarily to eliminate important targets. The bizarre shape of this weapon was directly related to the type of ammunition that the C-4 used to fire.
The pistol had two barrels for exactly two charges. The design of the C-4 was much more complex than that of most conventional pistols. Thus, the silent scout weapon required manual cocking of the firing mechanism before each shot. The pistol was loaded with special PZAM cartridges of 7.62x63 mm caliber. The maximum firing range from this was 10-12 meters. At the same time, the bullet had a very good penetrating effect.
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The mass of C-4 was 0.66 kg. With a pair of loaded cartridges, the weight increased to 0.7 kg. The length of the weapon was 140 mm. Under the condition of manual cocking and manual reloading, the rate of fire of the S-4 in capable hands could reach 6-8 rounds per minute. The muzzle velocity of the bullet was 145 m/s. The noiselessness of the weapon was achieved through the use of special cartridges, which, thanks to a number of design features, locked the powder gases in the sleeve. Later, on the basis of the S-4, a new pistol was created for the special services of the USSR, known as the SME "Groza".
If you want to know even more interesting things, then you should read about gun "Boa": why he really can not replace the legendary "Makarov".
Source: https://novate.ru/blogs/200322/62467/