![]() When the rifle is fired, gas enters the gas port housing pressure to thrust the piston rod back against the short tappet rod. Its removal for field maintenance takes less than three seconds. The latch located on the right side of the sight locks the handguard-gas cylinder into place. The rear end butts against the rear sight base, containing the tappet rod and tappet rod return spring. ![]() The front end of the combined gas cylinder and handguard fits over a gas port housing pinned to the barrel approximately 7 inches from the muzzle. The gas cylinder is an integral part of the handguard and contains the piston rod. Unlike its predecessor, the Tokarev, the SKS features an instantly dismountable gas system. Because of its light recoil and moderate weight, SKS can achieve 35 rounds per minute of aimed fire. The SKS and the PTRS were designed by the famed Russian arms inventor Sergei Simonov. ![]() It is a gas-operated, semi-automatic rifle and might be referred to as a miniature version of the 14.5mm PTRS semi-automatic antitank rifle used during World War 2. The SKS was adopted by the Soviet Union in 1946 and is the basis for the later AK series of weapons. ![]()
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