The PK is a 7.62 mm general purpose machine gun designed in the Soviet Union and currently in production in Russia. Its NATO equivalents are the FN MAG, MG3, and M60 machine guns. The PK machine gun was introduced in the 1960s and replaced the SGM and RPD machine guns in Soviet service. The PK machine gun can be used as a light anti-aircraft weapon when it is put on an AA mount. One feature typical to Soviet machine guns is that the standard model feeds from the right and ejects its spent cases via an ejection port on the left side of the weapon, as opposed to the usual right side ejection port seen in most western machine guns.The original PK ("Kalashnikov's Machine gun") was a evelopment of Kalashnikov's automatic rifle design, firing the 7.62x54mmR Eastern Bloc standard munition originally from the Mosin-Nagant. It is equipped with a simple bipod and is designed as a squad-level support weapon also suitable for installation and vehicle mounting. Most are belt-fed, using linked 25 round belts. These 25 round belts can be linked to any length necessary.