Source: davinciwolves on Instagram
A machine-gunner of the 108th. Mechanized Battalion “Da Vinci Wolves”, 59th. Motorized Brigade “Yakiv Handziuk”. He is armed with a PKM general purpose machine gun (GPMG), one of the most common machine-guns in use by the Ukrainian military as well as the armed forces of the Russian Federation. Entering service in 1961 as the PK (Pulemyot Kalashnikova; Kalashnikov's machine-gun), the modernized PKM (Модернизированный; Modernized) appearing in 1969. The PKM and its variants remain in production and equip dozens of military forces around the world.
The PKM is chambered for the Soviet 7.62x54mmR cartridge and the machine-gun uses a gas-operated, long-stroke piston, open/rotating bolt action. The open bolt assists in cooling the breech to prevent ammunition cook-off due to heat generated by automatic fire. The bolt and bolt carrier are upside down and the gas piston and the gas system are mounted beneath the barrel. The cyclic rate of fire of the PKM is 600 to 800 rounds per minute though the practical rate of fire is far less, being 250 rounds per minute. With the cartridge generating a muzzle velocity of 2,707 feet per second, the effective range of the PKM is 1,000 meters though its maximum range is 3,800 meters. Ammunition usually comes in 100-, 200-, or 250-round belts using non-disintegrating metal links with the belts kept in ammunition boxes. The 100-round belt box is considered the “assault” box as it can be attached to the bottom of the PKM. The larger belts are typically utilized when the PKM is being fired from a tripod, the tripod having mounts for the boxes. The rounds feed from the right and the spent brass ejects to the left. In practice, after firing 400 rounds in succession, the barrel is either changed out and replaced with another to give the removed barrel time to cool or the gunner ceases fire to permit the barrel to cool in place. Failure to do this risks bore wear.
The PKM weighs a tad shy of 20 pounds which includes the detachable bipod but does not include the assault ammunition box. If a full assault box is attached, the weight increases by 8 or 7 pounds depending on if the box is the standard one or the lighter, aluminum version. Normally, aiming is done using iron sights but the PKM can be fitted with aiming optics using a side-rail bracket on the left side of the receiver. The more common optical sight used is the 1P29, a 4x magnification optic. The rear iron sight is a sliding tangent type with 100 meter increments starting at 100 meters up to 1,500 meters. The rear sight also has small side dials to adjust for windage.
