For collectors, slamfires are more likely when the bolt still has remnants of Cosmoline embedded in it that retard firing pin movement.
As it is triangular in cross section with only one way to properly insert it (notches up), slamfires can also result if the firing pin is inserted in one of the other two orientations.
At the moment of firing, the bolt carrier is pushed rearwards, which causes it to lift the bolt, unlocking it, and allowing it to be carried rearwards against a spring.
Design-wise, the SKS relies on the AVS-36 (developed by the same designer, Simonov) to a point that some consider it a shortened AVS-36, stripped of select-fire capability and re-chambered for the 7.62×39mm cartridge.
In typical military use the stripper clips are disposable.
If necessary they can be reloaded multiple times and reused.
Both the Soviet Union and Germany realized this and designed new firearms for smaller, intermediate-power cartridges. The Soviet Union type qualified a new intermediate round in 1943, at the same time it began to field the Mosin–Nagant M44 carbine as a general issue small arm.
However, the M44, which had a side-folding bayonet and shorter overall length, still fired the full-powered round of its predecessors.
In most variants (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. Although it can diminish accuracy, its effect on practical accuracy in a rifle of this type is limited. The rear sight is an open notch type which is adjustable for elevation from 100 to 1,000 metres (110 to 1,090 yd).