The SKS is a semi-automatic rifle that was first produced in the Soviet Union during the Second World War. Designed to serve as a shorter-range counterpart to the Mosin Nagant, the SKS has been employed by the militaries of numerous countries since 1949, with many slav countries, dune-coon jihadis, and crackpot African dictators still using it to this day. Despite its more traditional, "non-tactical" appearance and default 10-round capacity, the SKS has enjoyed immense popularity among civilian firearm owners, especially /k/ommandos. This popularity is due to the SKS's relatively low cost, its (usually) hardy construction, and its cheap 7.62x39 round.
The SKS, or more accurately the SKS-45, was first designed in 1943 by Sergei G. Simonov. Its chief purpose was to help mitigate the problem of big-ass rifles like the Moist Nugget performing poorly during medium-range combat, and also to say "Да пошёл ты" to the Germans for beating the Soviets to the punch with the StG-44.