PK machine gun
The PK (Russian: Пулемёт Калашникова, transliterated as Pulemyot Kalashnikova, or "Kalashnikov's Machine Gun"), is a 7.62×54mmR general-purpose machine gun designed in the Soviet Union and currently in production in Russia. The original PK machine gun was introduced in 1961 and then the improved PKM in 1969 to replace 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. The PK has been exported extensively and produced in several other countries under license.
|PK general-purpose machine gun|
PKM general-purpose machine gun with modern black polymer furniture and a 100-round ammunition box
|Type||General-purpose machine gun|
|Place of origin||Soviet Union|
|Used by||See Users|
South African Border War
Cambodian Civil War
Salvadoran Civil War
Lord's Resistance Army insurgency
Tuareg rebellion (1990–1995)
Somali Civil War
Burundian Civil War
First Chechen War
Second Congo War
Second Chechen War
War in Afghanistan
Northern Mali Conflict
Cambodian–Thai border dispute
Lebanese Civil War
First Libyan Civil War
Second Libyan Civil War
Boko Haram insurgency
Syrian Civil War
War in Donbass
Yemeni Civil War
Saudi Arabian-led intervention in Yemen
Saudi–Yemeni border conflict (2015–present)
|No. built||1 million+|
|Mass||PK: 9 kg (19.84 lb) (gun + integral bipod) + 7.7 kg (16.98 lb) (tripod).|
PKM: 7.5 kg (16.53 lb) (gun + integral bipod) + 4.5 kg (9.92 lb) (tripod).
PKTM (tank): 10.5 kg (23.15 lb)
|Length||PK: 1,203 mm (47.4 in)|
PKM: 1,192 mm (46.9 in)
PKT: 1,098 mm (43.2 in)
|Barrel length||PK(M): 605 mm (23.8 in) (without muzzle device)|
PKT: 772 mm (30.4 in)
|Action||Gas-operated, open bolt|
|Rate of fire||PK, PKM: 650 rounds/min|
PKT: 700–800 rounds/min
Practical: 250 rounds/min
|Muzzle velocity||PK, PKM: 825 m/s (2,707 ft/s)|
PKT: 855 m/s (2,805 ft/s)
|Effective firing range||PK(M): 1,000 m (1,094 yd) (100–1,500 m sight adjustments)|
PKT: 1,500 m (1,640 yd) (100–1,500 m sight adjustments)
|Maximum firing range||PK(M): 3,800 m (4,156 yd)|
PKT: 4,000 m (4,374 yd)
|Feed system||Non-disintegrating metal 50 round belts in 100 and 200/250 round ammunition boxes|
|Sights||Tangent iron sights (default);|
Optical, Night-vision, Thermal and Radar sights
The Main Artillery Directorate of the Soviet Union adopted specification requirements for a 7.62 mm general-purpose company- and battalion-level machine gun, chambered for a rifle cartridge in 1955. In 1958 a machine gun prototype, developed by G.I. Nikitin and Yuri M. Sokolov, successfully passed field tests. Based on the results of the tests it was decided in 1960 to manufacture a batch of Nikitin-Sokolov machine guns for service tests and then put the machine gun into production at the Kovrov Mechanical Plant. When the Nikitin-Sokolov machine gun was almost completed, a team of Izhevsk Mechanical Plant designers, headed by M.T. Kalashnikov, and further consisting of V.V. Krupin, V.N. Pushchin, A.D. Kryakushin, as well as Startsev, Kamzolov, Koryakovtsev, Yuferev, joined the competition. Their machine gun prototype was based on the well-proven gas-operated rotary-bolt design of the Kalashnikov-pattern arms. The Kalashnikov and the Nikitin-Sokolov prototypes underwent service tests in the Central Asian, Odessa, and Baltic Military Districts, as well as at the Vystrel officer training courses in late 1960. The Main Missiles and Artillery Directorate and the Ministry of the Defence Industry preferred the Kalashnikov design. The Kalashnikov design was found to be more reliable and cheaper to manufacture than the design of Grigory Nikitin and Yuri Sokolov. The PK/PKS was put into production at the Kovrov Mechanical Plant and used the tripod mount and an ammunition belt boxes originally designed for the Nikitin-Sokolov prototype machine gun.
Nikitin's and Sokolov's machine gun design was later used in the 12.7 mm NSV heavy machine gun that was put into production in 1971.
The original PK was a development of Kalashnikov's AKM assault rifle and the accompanying RPK light machine gun design that featured stamped receivers. The PK uses the 7.62×54mmR Eastern Bloc standard cartridge that produces significantly more bolt thrust when compared to the Eastern Bloc 7.62×39mm and 5.45×39mm intermediate cartridges.
The bolt and carrier design are similar to the AK-47 and other modernized Kalashnikov-pattern weapons, as is the stripping procedure performed to remove those mechanisms from the gun for cleaning. The bolt and bolt carrier are however oriented upside down compared to the AKM, with the piston and gas system being underneath the barrel.
Unlike the AKM and RPK the PK machine gun series is an open bolt design, which improves heat management during automatic fire compared to closed bolt designs and helps avoiding the dangerous phenomenon known as "cook-off", wherein the firing chamber becomes so hot that the propellant contained in a chambered round unintentionally ignites, making the weapon fire until the ammunition is exhausted. Open bolt designs typically operate much cooler than closed bolt designs due to the airflow allowed into the chamber, action and barrel during pauses between bursts, making them more suitable for constant full-automatic weapons such as machine guns. General-purpose machine guns like the PK are further normally issued with several quick change barrels that during prolonged intensive use are swapped out allowing one barrel to cool while the machine gun fires with the other.
The rimmed 7.62×54mmR cartridges are set in a metal ammunition belt and are held against the shoulder inside non disintegrating looped links, leaving the rim exposed at the rear. The belt is mounted from the right side into the feedway of the PK machine gun. The PK uses a non-reciprocating charging handle on the right side of the receiver to charge the gun. Since the PK uses a rimmed rifle cartridge and closed-link belts used for feeding, a two-stage feed mechanism with a preliminary extraction of a cartridge from a belt link was preferred over a direct ammunition feed design often used for rimmed cartridges. The PK machine gun is equipped with a lever-type feed mechanism, mounted on the feed cover and operated by the feed lever, mounted on the right wall of the receiver and wrapping around the bolt carrier with its feed pawl and roller. The PK feed mechanism pulls the rimmed 7.62×54mmR cartridges out from the back of the ammunition belt and drops the cartridges down into the feed way, allowing the bolt to strip and feed the cartridges into the chamber for firing.
The breech is locked by a rotating bolt, with two locking lugs engaging locking recesses in the receiver. The gas piston is hinged to the bolt carrier assembly, and its vertical travel makes it possible to bend the group making machine gun assembly and disassembly for maintenance easier. The protruding rear part of the bolt carrier assembly features spiral shaped cuts, which provide a controlled rotation of the bolt. The mainspring is accommodated in the bolt carrier assembly slide channel. A cartridge extractor with a latch is mounted in the rear part of the bolt carrier assembly. The cocking lever, mounted on the right, is not integral with the bolt carrier and does not reciprocate as the gun fires. The machine gun fires from the rear sear.
The gas cylinder is mounted under the barrel and fitted with a gas regulator with three fixed positions. The gas regulator opens corresponding holes to change the amount of expanding propellant gases bled off out of the gas cylinder into the atmosphere, thus varying the amount of energy transferred on to the long-stroke piston.
The PK general-purpose machine gun U-shaped receiver is stamped from a smooth 1.5 mm (0.06 in) sheet of steel that is supported extensively by pins and rivets. For additional rigidity and strength the PK receiver features double walls made from 1.5 mm steel plates that are welded together with the U-shaped stamping. The receiver top cover is also stamped from 1.5 mm sheet metal and hinged on the front of the receiver and locked at the back with a spring-loaded latch.
The quick detachable barrel assembly slides into the receiver and attaches by a barrel-lock. On the original PK it was partially fluted to increase rigidity and improve heat dissipation. The barrel-lock also regulates the gap between the breech face and the breech end of the barrel. PK barrels have a folding carry handle/grip that is positioned to the left of the receiver and is used to transport the weapon and quickly and safely change-out barrels to prevent barrel overheating. The bore is chrome-lined and features four right-hand grooves at a 240 mm (1 in 9.45 in) rifling twist rate. The muzzle is threaded for the installation of various muzzle devices such as a flash hider. The muzzle was normally equipped with a conical flash suppressor that added 53 mm (2.1 in) to the barrel and later a long slotted flash suppressor that added 72 mm (2.8 in) to the barrel. Later when the PKM variant was introduced the PK series barrel fluting was omitted and the muzzle device was changed to a shorter cylindrical slotted flash suppressor that added 40 mm (1.6 in) to the barrel. The PKM barrel assembly weighs 2.4 kg (5.3 lb) and can fire up to 400 rounds in rapid fire scenarios before it has to be replaced for another barrel or allowed to cool down to prevent unacceptable wear of the bore.
The rear sight assembly is riveted onto the receiver cover and consist of a square notched rear tangent iron sight calibrated in 100 m (109 yd) increments from 100 to 1,500 m (109 to 1,640 yd) and includes a "point-blank range" battle zero setting corresponding to a 330 m (361 yd) zero. It is identical in design to the AKM and Mosin–Nagant, except that it is oriented backwards with the notch forward and the hinge behind. The iron sight line has a 663 mm (26.1 in) sight radius. Like the RPD rear sight, the PK rear sight also features full windage adjustment in the form of small dials on either side of the notch.
The front sight assembly is mounted near the end of the barrel and consists of a protected open post adjustable for elevation in the field.
PK machine guns that feature a Warsaw Pact side-rail bracket on the left side of the receiver can mount various aiming optics. The standard Russian side rail mounted optical sight was the 4×26 1P29 Universal sight for small arms, an aiming optic similar to the British SUIT and SUSAT and Canadian C79 optical sights. When mounted, the 1P29 sight is positioned centered above the receiver at a height that allows the use of the iron sights. It weighs 0.8 kg, offers 4× magnification with a field of view of 8° and 35 mm eye relief. The 1P29 is issued with a canvas pouch, a lens cleaning cloth, combination tool, two rubber eyecups, two eyecup clamps and three different bullet drop compensation (BDC) cams for the AK-74, RPK-74 and PK machine gun. The 1P29 is intended for quickly engaging point and area targets at various ranges. On the right side of the field of view a stadiametric rangefinder is incorporated that can be used to determine the distance from a 1.5 meters (4 ft 11.1 in) tall object from 400 to 1,200 m (437 to 1,312 yd). The reticle is an inverted aiming post in the top half of the field of view and is tritium-illuminated for low-light condition aiming. A later designed similar optical sight suitable for the PK machine gun series is the 4×24 1Р77
The trigger assembly, mounted inside the receiver, is operated by the mainspring and suitable for automatic fire. It has no single shot mode. The manual rotating type safety locks the sear, which engages the sear notch of the bolt carrier assembly, and the trigger lug does not allow the bolt earner assembly to go all the way back.
The skeletonized buttstock, pistol grip and folding carry handle/grip on the barrels were originally manufactured from birch plywood laminates. Such engineered woods are stronger and resist warping better than the conventional one-piece patterns, do not require lengthy maturing, and are cheaper. The wooden furniture was finished with the Russian amber shellac finishing process. Small accessories and an oil-solvent container can be stored inside butt recesses. Later the buttstock was fitted with a hinged butt-rest. More recent PKM machine guns and barrel assemblies are equipped with a new black glass-filled polyamide buttstock, pistol grip and barrel carry handle/grip shaped like the previously used laminated wooden stock and grips.
PK machine guns are belt-fed, using non-disintegrating metal belts, which have links that wrap around the cartridge case shoulder all the way around, and are linked by a coiling wire on each side. The links are made of 0.8 mm (0.03 in) thick high carbon stamped steel sheet metal that is zinc phosphated and varnished for protection. These belts are preloaded at ammunition factories in 25-round connectable belt lengths and can be linked to any length necessary. Factory connected PK ammunition belts are available in 25, 100, 200 and 250 rounds lengths. Typical of Soviet machine guns, the PK feeds from the right and ejects its spent cases via an ejection port on the left side of the weapon, contrary to the right side ejection port seen in most Western machine guns.
For the light machine gun role, the PK is used as the standard squad automatic weapon of the Russian Army. The PK uses a 100-round non-disintegrating belt contained in a metal box made from an aluminum frame and steel cover that can be attached under the gun's receiver. The 100-round belt "assault" box has a folding lid in its cover for feeding the ammunition belt when the box is attached under the machine gun receiver and weighs 3.9 kg (8.60 lb) or 3.4 kg (7.50 lb) for the modernized all aluminum lightweight variant. When the machine gun is fired from a bipod, the 100-round ammunition box is normally attached to the underside of the receiver.
For the medium machine gun role, there is also a 200/250-round ammunition box made from an aluminum frame and steel cover available which can be mounted on the tripods used for the PK machine gun series. A 200/250-round ammunition box containing a 250-round non-disintegrating belt weighs 9.4 kg (20.72 lb) and containing a 200-round non-disintegrating belt weighs 8 kg (17.64 lb) or 6.2 kg (13.67 lb) for the modernized all aluminum lightweight variant. Both metal ammunition boxes have canvas carry handles.
All openings on the machine gun, particularly the ejector port on the left and the belt feed entrance on the right, are covered with spring-loaded dust covers so that the openings are only exposed when they need to be.
The PK is equipped with a simple detachable bipod mounted to the gas cylinder beneath the barrel and in that setup is used as a squad-level support weapon. The right bipod leg accommodates links of a cleaning rod. Other accessories include a sling and storage covers.
The PK machine gun is also suitable for installation on tripod mounts, vehicle mounting and can also be used as a light anti-aircraft weapon against slow flying aircraft when it is put on an AA mount.
As with all general-purpose machine guns, tripod and vehicle mountings offer a higher degree of accuracy and control than when used on a less stable bipod. The PK machine gun, firing short bursts from a bipod, as a light machine gun has the following accuracy of fire: a mean deviation of 7–10 cm (2.8–3.9 in) at a range of 100 m (109 yd), 37–51 cm (15–20 in) at 500 m (547 yd), and 71–103 cm (28–41 in) at 1,000 m (1,094 yd).
For heavier employment, the PKS ("PK Mounted") is based on the Samozhenkov 6T2 tripod mount. The PK and 6T2 tripod weigh 16.5 kg (36.38 lb).
The 6T2 Samozhenkov tripod mount was designed by E. S. Samozhenkov and entered service in 1961 and weighs 7.5 kg (16.53 lb). The 6T2 Samozhenkov tripod mount was earlier envisioned for the Nikitin-Sokoiov machine gun that was not adopted by the Soviet Union. All types of ammunition belt boxes are carried and mounted separately. The Rakov device is used for loading ammunition belts. The PK machine gun is attached to a cradle on the 6T2 Samozhenkov mount. The cradle is hinged to a plug-in swivel equipped with a rack-and-pinion traversing mechanism, and a rod-and-screw elevation mechanism. The traversing mechanism is fitted with stops to limit the field of fire. For anti-aircraft fire or fire against ground targets from a kneeling position the cradle mounts a collapsible pole with a pivoting bracket. The mount features non-digging-in spades — sliding spades affect the accuracy of fire less than a "jumping" tripod with dug-in spades. There is an extra folding spade on the front leg for slippery and moving ground. Hinged tripod legs allow a gunner to fire the machine gun from a prone, a sitting, or a kneeling position.
The PKS machine gun, firing bursts from its tripod with fixed traversing and elevation mechanisms, as a medium machine gun has the following accuracy of fire: mean deviation of 5–6 cm (2.0–2.4 in) at a range of 100 m (109 yd), 25–29 cm (9.8–11.4 in) cm at 500 m (547 yd), and 49–68 cm (19–27 in) at 1,000 m (1,094 yd).
The PKM (ПК Модернизированный: "Kalashnikov's Machine-gun Modernized"), was adopted into service in 1969. The PKM is a modernized, product-improved version of the PK. The upgrades, primarily aimed at reducing the weight, simplifying production, and facilitating easier operation. The receiver cover became more rigid due to lengthwise ribs. The butt was fitted with a hinged butt-rest. The barrel fluting was omitted and the flash hider was changed. Later on the PKM was equipped with a new black glass-filled polyamide buttstock and pistol grip shaped like the previously used laminated wooden stock and grip.
The PKMN (ПКМ Ночной: "PKM Night-Vision") is a variant that can mount a night sight for low-visibility operations. The PKMN-1 can thus mount the multi-model NSPU-3 (1PN51) night vision scope while the PKMN-2 can mount the multi-model NSPUM (1PN58) night vision scope. It can also be fitted with the 1PN93 series passive night sights.
Besides that Shakhin and 1PN116 thermal sights and the 1PN119 anti-sniper special-purpose night vision sight are available for mounting on PK machine guns that like the PKMN model feature a Warsaw Pact side-rail bracket on the left side of the receiver for mounting aiming optics.
For heavier employment, the PKMS (ПКМ Станковый: "PKM Mounted") is mounted on the Stepanov 6T5 tripod mount. The PKM and 6T5 tripod weigh 12 kg (26.46 lb).
The tripod mount, designed by L. V. Stepanov for the PKM machine gun entered service in 1969 and weighs 4.5 kg (9.92 lb). It is a lighter mount for the PK(M) general-purpose machine gun without affecting the accuracy of fire. Besides, the Stepanov mount has 20 fewer components than the preceding Samozhenkov tripod and is 40% less labour-intensive. The Stepanov mount is based on a principle of multi-functional components: the elevation mechanism frame is also used as a pole for kneeled shooting or anti-aircraft fire; the base sleeve also serves as the axis for attaching rear legs of the tripod: the machine gun attachment is combined with the elevation mechanism frame lock for anti-aircraft fire; the fine elevation adjustment mechanism is integrated with the elevation mechanism axis. The ammunition belt box can be secured to the right rear tripod leg. This enables one crew member to carry and operate the gun in combat without having to unload the gun before repositioning the gun.
The PKMSN (ПКМС Ночной: "PKMS Night-Vision") is similarly to the PKMN a special model of the tripod-mounted variant that can mount night sights for low-visibility operations.
The PKMSN model can use NSPU-3 (1PN51) and NSPUM (1PN58) night sights. It can also be fitted with the 1PN93 series passive night sights.
Besides that Shakhin and 1PN116 thermal sights and the 1PN119 anti-sniper special-purpose night vision sight are available for mounting on PK machine guns that like the PKMSN model feature a Warsaw Pact side-rail bracket on the left side of the receiver for mounting aiming optics.
The PKT (ПК Танковый, "PK Tank") (1968) is a solenoid-fired coaxial version of PK to replace the SGMT Goryunov vehicle-mounted machine gun. Modifications include the removal of the stock, a longer and heavier barrel, a gas regulator and an electric solenoid trigger. The PKT is usually fed from 250-round ammunition boxes. The PKT barrel assembly weighs 3.23 kg (7.1 lb) and can fire up to 500 rounds in rapid fire scenarios before it has to be replaced for another barrel or allowed to cool down to prevent unacceptable wear of the bore.
- R50 at 300 m (328 yd) means the closest 50% of the shot group will all be within a circle of the mentioned diameter at 300 m (328 yd).
Modernized version of PKB.
- The PKP Pecheneg (6P41) (2001) is a further development and modification of the PKM. It has a heavy fixed barrel encased in a radial cooling sleeve that uses forced-air cooling, much like the Lewis Gun of World War I.
- 6P41N Pecheneg-NP version with a rail for mounting nightscopes.
- Pecheneg-SP improved modernized version.
HCP PKM-"NATO" (Poland)
In the early 1990s, as part of the preparations to join NATO, the Polish armed forces were looking for a replacement for the PK-series machine guns then in service. The H. Cegielski - Poznań S.A. Works in Poznań modified the PK/PKS to feed standard 7.62×51mm NATO cartridges and use NATO standard ammo belts. The new model received the code-name PKM-NATO. The modifications included a heavier barrel, a larger chamber, and a redesign of the lock, extractor, and the entire feeding mechanism. The prototype was tested from 1997 to 1999, but was rejected. The Polish Army adopted the UKM-2000 machine gun instead – which was also based on the PKM.
Zastava M84/M86/M09/M10 (Yugoslavia/Serbia)
The Zastava M09 is a copy of the PKM with black synthetic furniture, chambered in 5.56x45 NATO ammo. The Zastava M10 is a variant of the M09 with a solid stock.
Norinco Type 80 (People's Republic of China)
The Type 80 is a Chinese-made copy of the PKM/PKMS.
Arsenal MG, MG-M1, MG-M1S & MG-1M (Bulgaria)
Arsenal originally produced the MG, modeled after the original Russian PK model. The MG-M1 is a licensed copy of the PKM with a synthetic buttstock and pistol grip. The MG-M1S only differs from the MG-M1 model due to the use of a tripod by the M1S model, where as the M1 model uses the original bi-pod design. The MG-1M, an improved Squad Automatic Weapon variant, has improved features, such as a redesigned barrel that allows for better cooling.
Cugir Mitraliera md. 66 (Romania)
The Mitraliera md. 66 is a Romanian-made copy of the PKM.
KGK general purpose machine gun (Hungary)
The KGK universal (general purpose) machine gun was based on the SG43 Goryunov machinegun and produced in Hungary during the 1960s and 1970s. It was used by the Hungarian army on a limited scale and was later replaced by a domestically produced copy of the Kalashnikov PKM machine gun.
The PKM and other variants are in production in Russia and are currently exported to many nations. Additionally, various models are manufactured locally around the globe. Zastava Arms produces the PK under license as the M84 (along with the PKT as the M86), and it remains in use with many of the former Yugoslav successor states. The most recent modification is the Russian Pecheneg, which features a forced air cooling barrel that cannot be removed in the field for quick replacement, unusual for a modern machine gun.
Afghanistan Albania Algeria Angola Armenia Azerbaijan Bangladesh: Type 80 variant. Belarus Bosnia and Herzegovina Bulgaria: PK/PKM copies were produced as the MG-1 & MG-1M. Burundi: Used by Burundian Peacekeepers in The Central African Republic. Also used by Burundian rebels Cambodia Cape Verde Central African Republic Chad China: PK/PKM copies were produced as the Type 80. Colombia: Used captured FARC PK/PKMs by the military and police during the Colombian conflict. Croatia Cuba Czech Republic Democratic Republic of Congo: FARDC Egypt Eritrea Estonia Ethiopia Fiji Finland: Designated as 7.62 KK PKM. Gambia: Used by Gambian Peacekeepers in Darfur. Georgia: Phasing out. Grenada Guinea Guinea-Bissau Guyana Hungary India: Captured PKMs and imported Bulgarian PK variant used by Para SF, Special Frontier Force and Special Group. PKT Manufactured at Ordnance Factory Tiruchirappalli of the Ordnance Factories Board . Iran: PKS and PKT variants. Incorrectly called "Goryunov", mostly because of the cartridge being the same as SG-43 Goryunov. Iraq: PKS and PKT variants. PKS being called "Be-Ke-Se" Islamic State Israel Ivory Coast Kazakhstan Kenya Kosovo Kyrgyzstan Laos Latvia Lebanon Libya Malawi: Used by Malawian peacekeepers in the Democratic Republic of the Congo. Mali Malta: Armed Forces of Malta Moldova Mongolia Montenegro Mozambique Nicaragua Nigeria Niger North Korea: Clones made known as the Type 82. Panama Poland: PK/PKM copies were produced. Republic of Macedonia Romania: PK/PKM copies were produced as the Mitraliera md. 66. Russia Rwanda Saudi Arabia São Tomé and Príncipe Sierra Leone: used on vehicles South Africa: Used by the South African Special Forces South Sudan Sudan manufacture locally as Mokhtar Serbia: Made under license as the Zastava M84/M86. Slovenia Somalia Sri Lanka: Type 80 variant. Syria Tajikistan Tanzania: Used by Tanzanian Peacekeepers in Darfur. Turkmenistan Turkey Known as Biksi or Bixi in Turkish service. MKEK announced production of PKs. Uganda Ukraine PKT, PKM locally produce as KT-7.62 and KM-7.62 by Mayak. Uzbekistan Vietnam: Supplied by the Soviets in the late 1970s. Made under license by Z111 Factory. Yemen Zambia Zimbabwe
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