The PKM (ПК Модернизированный: "Kalashnikov's Machine-gun Modernized"), was adopted into service in 1969. It is a modernized, product-improved version of the PK weighing only 7.5 kg without ammunition.
The PK is a 7.62 mm general-purpose machine gun designed in the Soviet Union and currently in production in Russia. The PK machine gun was introduced in the 1960s and replaced the SGM and RP-46 machine guns in Soviet service. It remains in use as a front-line infantry and vehicle-mounted weapon with Russia's armed forces, and has been exported extensively.
The original PK (Пулемёт Калашникова: Pulemyot Kalashnikova, or "Kalashnikov's Machinegun") was a development of Kalashnikov's AK47 automatic rifle design, firing the 7.62x54mmR Eastern Bloc standard ammunition originally from the Mosin–Nagant. The bolt and carrier design are similar to the AK, as is the stripping procedure performed to remove those mechanisms from the gun for cleaning.
The bolt and bolt carrier are oriented upside down compared to the AK, with the piston and gas system being underneath the barrel. The long stroke piston is hinged off the bolt carrier group to make it possible to bend the group in and out of the receiver for maintenance. The gun uses a non-reciprocating charge handle on the right side of the receiver to charge the gun, and the gun fires from an open bolt, which improves cooling compared to a closed bolt design, and prevents the gun from being able to cook off if extremely overheated. The barrel is a quick detach type with a carry handle that sits to the left of the receiver. The rear sight is identical in design to the AK and Mosin–Nagant, except that it is oriented backwards with the notch forward and the hinge behind. It also features full windage adjustment in the form of small dials on either side of the notch, a feature not seen on the guns that preceded it.
The rimmed 7.62x54mm cartridges are set in the belt, held against the shoulder inside the full looped links, leaving the rim exposed at the rear. Rimless cartridges can be fed forward through the link with semi-looped links. The PK series of guns uses a mechanism to pull the rounds out of the belt from the back and drops it down into the feed way, allowing the bolt to strip it and feed it into the chamber upon firing.
This weapon is the ninth Tier for Light Machines and is currently the last to be acquired normally.
- This weapon was the ninth (IX) Tier for Light Machines, the ninth Tier are now the M96-H and the M240L.
- Modmaster Series III (3) version was added 3rd of March 2015