The SKS is a Soviet semi-automatic rifle chambered for the 7.62x39mm round, designed in 1945 by Sergei Gavrilovich Simonov. SKS is an acronym for Samozaryadnyj Karabin sistemy Simonova, 1945 (Russian: ???????????? ??????? ??????? ????????, 1945; Self-loading Carbine of (the) Simonov system, 1945), or SKS 45. The Soviets rather quickly phased the SKS carbine out of front-line service, replacing it with the AK-47, but it remained in second-line service for decades. It remains a ceremonial arm today. It was widely exported and produced by the former Eastern Bloc nations, as well as China, where it was designated the "Type 56", East Germany as the "Karabiner S" and in North Korea as the "Type 63". It is today popular on the civilian surplus market in many countries. The SKS was one of the first weapons chambered for the 7.62x39mm M43 round later used in the AK-47 and RPD.

SKS Pouch

Technical specifications

The SKS has a conventional carbine layout, with a wooden stock and no pistol grip. Most versions are fitted with an integral folding bayonet which hinges down from the end of the barrel, and some versions, such as the Yugoslavian-made M59/66 variant, are equipped with a grenade launching attachment. As with the American M1 carbine, the SKS is shorter and less powerful than the semi-automatic rifles which preceded it—most notably, the Soviet SVT series and the American M1 Garand. Contrary to popular belief, the SKS is a carbine and not a modern assault rifle, because it does not meet all the criteria for such a weapon. The basic design lacks both selective fire capability, and a detachable magazine. Some selective-fire variants were produced in the PRC, and many SKS's have been modified in various ways to accept detachable magazines; however, the basic design of the SKS is semi-automatic and fixed-magazine in nature. The carbine's ten-round box magazine is fed from a stripper clip (see below), and rounds stored in the magazine can be removed by depressing a magazine catch (thus opening the "floor" of the magazine and allowing the rounds to fall out) located forward of the trigger guard.

Design

A standard SKS is semi-automatic and has a fixed/hinged 10 round internal magazine which is loaded from the top of the rifle either by manually inserting the ammunition one round at a time or with a 10-round stripper clip. In typical military use the stripper clips are disposable. If necessary they can be reloaded multiple times and reused. The SKS is a gas-operated weapon that has a spring-loaded operating rod and a gas piston rod that work the action via gas pressure pushing against them. Also, it has a "tilting bolt" action locking system. Some variants of the SKS have been modified, with limited success, to accept AK-47 detachable magazines (military rifles designed with fixed magazines often experience feed jams when modified to accept detachable magazines, and the SKS is no exception). Norinco had, at one point, manufactured the SKS-M, SKS-D, and MC-5D models which were engineered from the factory to accept AKM magazines without problems (though the wood stock must be relieved to accept drum magazines). The SKS also has a slightly longer barrel than AK-series rifles, with a fractionally higher muzzle velocity.
The SKS can be quickly reloaded using disposable 10-round stripper clips.

While early Russian models had spring-loaded firing pins, most variants of the SKS have a free floating firing pin within the bolt. Because of this design, care must be taken during cleaning (especially after long storage) to ensure that the firing pin does not stick in the forward position within the bolt. SKS firing pins that are stuck in the forward position have been known to cause accidental "slamfires" (uncontrolled automatic fire that empties the magazine, starting when the bolt is released). This behavior is less likely with the hard primer military-spec ammo for which the SKS was designed, but as with any rifle users should properly maintain their firearms. For collectors, slamfires are more likely when the bolt still has remnants of cosmoline embedded in it. The firing pin is triangular in cross section, and slamfires can also result if the firing pin is inserted upside down. Third party kits are available that can put old-style spring-loaded firing pins in SKS's that did not come with them, increasing the reliability and reducing the chance of slamfires.

In most variants (pre-1970 Yugoslav models being the most notable exception), the barrel is chrome-lined for increased wear and heat tolerance from sustained fire and to resist corrosion from chlorate primed corrosive ammunition, as well as to facilitate cleaning. Chrome bore lining is common in military rifles. Although it can diminish practical accuracy, this is not a real limit on field grade accuracy in a weapon of this type.

All military SKSs have a bayonet attached to the underside of the barrel, which is extended and retracted via a spring-loaded hinge (some are removable whereas some are permanent). Both blade and spike bayonets were produced. The SKS is easily field stripped and reassembled with no tools. The rifle has a cleaning kit stored in a trapdoor in the buttstock, with a cleaning rod running under the barrel, in the same style as the AK-47. In common with some other Soviet-era designs, the SKS trades some accuracy for ruggedness, reliability, ease of maintenance, ease of use, and low manufacturing cost. The SKS is a simple design that is highly effective and rugged.

SKS Pouch