PKK on the device actually is similar machine, their parts and accessories for the most part interchangeable. The main differences are the long heavy barrel, folding bipod and a regular store of greater capacity. The barrel with a length of 590 mm, has permitted to increment up to 800 meters effective range. Increasing the capacity of the store and increased thickness of the walls of the barrel allows for a more intense fire. When shooting with the way the bipod improved accuracy.
In automation scheme is implemented through the removal of powder gases formed in the side wall of the trunk opening. Turning the bolt is locking the barrel, with all this fighting pair of protrusions gate go into the grooves receiver. The gas piston and piston rod connected to the bolt aggressively. The bolt frame Automation is the leading element: frame is the direction of motion of moving parts, is seen most of the shock, revertible spring placed in a longitudinal channel. Handle reloading and bolt frame is placed on the right and at the same time. During firing the powder gases are moved into the gas chamber, bolt carrier and gas piston begin to move backwards. Once the frame fades into the distance required, recycled gases are discharged into the atmosphere through the opened holes in the gas tube. The bolt frame extends to the pressure drop a certain distance, then the bevel vypalenny on its inner surface presses the shutter projection own face and it cranks. When unlocking the shutter preparatory rotation and "Breakaway" (offset) sleeve, located in the chamber. This reduces the coupling sleeve and the walls of the chamber, also predutverzhdaet her break during the next extraction. After tripping the shutter and the receiver, a spring-loaded ejector cartridge cases recovered. The gate to the bolt begins to move backwards, cocking and squeezing revertible spring. Cartridge cases after striking a hard reflector receiver, crashes through the window of the receiver on the right. Reaching the back of the last point, shutter and bolt carrier under the influence of spring revertible move forward, the next cartridge captured the gate and be sent to the chamber. Bolt carrier stops moving and the shutter continues to move forward by inertia, turning on the bevel frame, locking the barrel. Relatively heavy bolt with a relatively light gate, and "hung out" position in the receiver with respect to the moving parts bolshennymi clearances gave an opportunity to provide system performance criteria, even in dusty conditions. In addition, the bolt is covered by the bolt, thereby providing Makar, protecting it from contamination and impacts. Back-stop guide rod revertible spring latch is pressed the light receiver cover.
Trigger mechanism with percussion hammer rotating on an axis and the U-shaped mainspring, which is made of a double helical wire. Trigger device allows single and continuous fire. A single rotating part is the translator (switch) fire mode and dual thumb safety acts: being locked in position protection trigger, sear the continuous and single lamp and prevents movement of the bolt back, partly overlapping the slot cover between the receiver and the receiver. With all of this valve can be diverted back to inspect the chamber, but his speed is not enough to cock the trigger and the chamber hand in these subsequent cartridge. All parts of the trigger and automatic compact mounted in the receiver, which plays such Makar, the role of the body trigger. The receiver is manufactured by stamping some details — in a manner of investment casting and powder metallurgy.
I experienced light machine guns was slightly modified with a rifle butt, but a reference to the serial has been taken form the butt of his predecessor — the RPD machine gun. During the shooting stops with subtle neck butt allows you to encircle it with his left hand. At the sight there is a mechanism for lateral correction movement of the target or the wind. Firing with the way made it possible to dispense with the equalizer. Shoplifting supply system, inherited from the machine, forced shops to create a larger capacity — Sector box containing 40 rounds of ammunition and a drum (disk) capacity of 75 rounds. Shops PKK and automata (capacity 30 rounds) are interchangeable.
For firing ammunition can be used in several types: the usual bullet "SS" has a metal heat-treated core (bullet weight 7.9 grams, the index chuck 57N231), a tracer bullet "T-45" (7,45-7,67 gr bullet weight , the head part is painted in green color), armor-piercing incendiary "BZ" (7,47-7,87 gr bullet weight, the head part is painted a dark color and has a red band), petrol (bullet weight 6,47-6,8 g , the head part is painted in a reddish color). Weight cartridge having a normal bullet is 16.2 g, and 1.8 grams of powder charge. Fire may be conducted with the bipod or hand-focusing butt in the shoulder. Shooting with a belt "from the hip" is allowed on the move — it does not give Sighting, but at some point in the fight may have a psychological impact on the enemy, and this explains the preservation of this method since the First World War to the present day. Shot with a closed gate the risk of spontaneous firing in heating up the chamber does not increase if the fire is small bursts.
For the Navy developed a model RPKS having folding butt on the left of the same shape as the PKK. Folding butt in the firing position is fixed by a special latch. As a result, RPKS was 0.3 kg heavier than the PKK. For RPK light machine guns and RPKS modifications were made RPKN and SSBNs, respectively, which have been adapted for mounting the night sight. RPK machine guns and RPKS steel tool to support airborne (motorized) department. In some conflicts RPKN kitte
d out a telescopic sight was used as a "substitute" sniper rifle — it was perhaps due to the fact that the base of the machine machine gun inherited the single-fire.
Broad standardization of parts and assemblies with AKM already familiar in the production of a much simplified creation RPK light machine gun, and his research in the army (even more so that the system Kalashnikov is one of the most common in the development and exploration). Important is the ease of maintenance, disassembly and maintenance. Reasonableness, technological and constructive Bringing typical elegance and relative simplicity scheme with a broad application of the principle of multifunctionality details reasoned the highest reliability in all criteria. Vyatskopolyansky Machine Works "The Hammer" became the main producer of the PKK.
Designers KT Kurenkov and NF Makarov on the basis of the PKK was designed "krivostvolny" tank gun has a deviation of the line of motion bullets at 90 °, but it was not adopted, but before the data are used in machine guns tried caponier installations. The plant "Hammer" during conversion avalanche released on the basis of RPK light machine gun hunting carbine "Wild Boar" — after a couple of years of improvements this unique example of transfer of machine guns in the "hunting" area gave a good result.
RPK machine gun was accepted for service in the armies of more than 20 countries. In some countries, performed his options to either copy. For example, in Yugoslavia produced machine guns "Kalashnikov Assault" 72V1 chambered for 7,62 x39, which is characterized by the introduction of the length of the barrel fins and 72AV1 have an iron butt. Export version of the gun 77V1 to NATO cartridge 7,62 x51 box magazine equipped with a different shape and a carrying handle. Coupled with guns 80 and 80A in the family of instruments under 5,56 x45 (M193) produced manual gun Model 82 has unchanging folding butt and 82A, both models have a carrying handle. In turn, the Yugoslav guns were delivered in some countries — for example, in Iraq fell M72V1. Chinese copy of the Type 73 and 81, have kept the general scheme of RPK light machine gun, but have some differences. In Finland, carried machine gun M78 "Valmet".
Technical properties of the light machine gun RPK:
Cartridge — 7,62 x39;
Weight of machine gun without magazine 4.8 kg;
Weight of machine gun equipped with a shop on 40 (45) rounds — 5.6 kg;
Weight of machine gun equipped with a shop on the 75 rounds — 6.8 kg;
Length of gun — 1040 mm;
Barrel length — 590 mm;
Number of grooves — 4;
Step rifling — 240 mm;
The initial velocity — 745 m / s;
Muzzle energy — J 2192;
Rate of fire — 600 rounds per minute;
Combat rate — 150 rounds per minute;
Effective range — 1000 m;
Blank range on the chest figure — 365 m;
Blank range by a growth figure — 540 m;
Range of slaughter act bullets — 1500 m;
Maximum range of a bullet — 3000 m;
Capacity — 40.75 cartridges.