The trigger mechanism of a Kalashnikov assault rifle of any modification consists of a large number of moving parts. They must be properly secured to the frame of the machine so that they remain movable, but firmly fixed relative to each other and ensure uninterrupted operation in all conditions.
The USM AK-74 axis, which you can buy using the services of our online store, is the main tool for fixing the parts of the firing mechanism. This component will certainly come in handy for every person who wants to assemble their own chilled or training copy of the machine. In addition, the USM axle on the AKM will also be required in large quantities by the owners of the already finished AK SHP - in order to be able to replace the existing ones.
Where is the axle used to assemble the USM?
Many readers will certainly be interested in where in the design of the mechanism an axis is used to assemble the USM AKM. The answer is quite simple - every detail that works in the trigger mechanism of the machine through rotational movement requires fastening to such an axis.
The axis of the USM AKM and other modifications of the Kalashnikov assault rifle is used to secure the trigger, sear, firing separator, and . Especially for fixing these components in the body of the machine, there are special holes for accommodating the axes.
Considering that all Kalashnikov-designed assault rifles and sports and hunting carbines made on their basis use a large number of similar parts, the axis USM "Vepr" has exactly the same characteristics and dimensions. The axis of the USM "Saiga" also has the same design. For this reason, the described product can be used to assemble and maintain any Kalashnikov assault rifle made on the basis of the concept.
It is worth noting that the trigger axis on the AKM can be used by individuals solely for the design or improvement of chilled and mock-up copies of the AK and weapons like it. Functioning specimens suitable for shooting real cartridges are strictly prohibited by the Federal Law "On Weapons" to assemble and modify independently without a special license. Violation of this law is punishable under Article 223 of the Criminal Code of the Russian Federation - we warn you about this so that you purchase the offered goods exclusively for purposes permitted by law.
You can buy USM AKM axle in our online store!
You can buy USM AKM axle in our online store. Why buy this product from us?
Firstly, we offer to purchase an AKM trigger axle at affordable and competitive prices. We try to keep our prices at the right level so that cooperation with us is more profitable for you than searching for similar products in the stores of our competitors.
Secondly, an axis in proper workmanship is not always possible. We make sure that our goods are in good operating condition and free from any defects. Proper storage and regular thorough checks of the entire range allow you to achieve the lowest possible level of defects - you will not be able to buy poor quality goods from us.
Thirdly, we have the axle for assembling USM AKM in large quantities. You can always order the number of components you need, and they are unlikely to be out of stock. As a result, you will be able to get the parts you need faster than when buying from many of our competitors - this is facilitated by a competent delivery service in Moscow and well-established supply channels to other regions of Russia by mail.
According to the results of tests and competition in 1959, the newest brainchild was adopted by the Soviet army. design office Kalashnikov - AKM, which demonstrated high reliability, accuracy and accuracy when firing. At the same time, a significant role was played by the fact that the Kalashnikov assault rifle of the previous modification had already been sufficiently mastered by industry, security forces and military personnel.
What's left of AK
- Automation;
- bore locking system;
- return mechanism;
- USM AKM with automatic and single fire, as well as a flag non-automatic sector of the translator-fuse;
- All systems and mechanisms fit into the receiver.
It should be noted that in both products the moving parts of the automation have significant gaps. This ensures reliability in its operation, including operation in conditions of significant pollution, which increase the load on the gas chamber, so the holes for the emission of powder gases in the AKM were made in the gas chamber.
Design improvements in AKM
The AKM receiver was made by stamping, welding and riveting. This made it possible to reduce the weight of the box and reduce metal consumption in the production process by 80%. The strength of the lightweight receiver cover was reinforced with transverse stiffeners.
Improved accuracy of fire:
- The introduction of a mechanical trigger retarder;
- Increasing stability in the horizontal plane during firing.
The duration of the automatic cycle was slightly increased, but the accuracy was increased. Improved or to some extent changed the details of the trigger mechanism, while maintaining its overall design.
The increased accuracy made it possible to increase the aiming range to a thousand meters. True, in a real combat situation, fire is more often conducted at short distances. For shooting at dusk, luminescent devices were added, worn both on the rear sight and on the front sight.
The reduction in the mass of weapons was achieved due to changes in technology. Using not steel sheets, but aluminum-based light alloys, they reduced the mass of AKM magazines. The cases of lightweight stores were reinforced with stampings.
Previously used wood parts, or rather birch blanks, were replaced. AKM butts began to be made from plywood tiles, handguards - from glued veneer. Pistol grips were made using plastic. Although already in the 1960s, AKMs with plastic stocks (made of fiberglass), handguards and handguards began to be supplied to the troops. Plastics are also used today in the manufacture of AKM magazine cases.
Bladed bayonets were replaced with a universal AKM bayonet-knife equipped with a sheath with rubber lining. AK assault rifles along with SKS self-loading carbines in Soviet army completely replaced by AKM assault rifles.
Who mastered the main production of AKM
The position of the general manufacturer of AKM in the country was assigned to the Izhevsk Machine-Building Plant. The production of the machine went hand in hand with a continuous process of process improvement in order to minimize costs and improve quality.
The widespread introduction of advanced technologies has begun. For example, parts with precision castings were made from investment models. A phosphate-lacquer coating of parts was produced instead of the previous one with chemical oxidation. Powder metallurgy was used, plastics were more often used. The barrel channels were formed in the AKM assault rifles, however, as in the AK, with the help of dorning.
In the early 1970s, rotational forging began to be used in the production of barrels. As a result, automata without changing the basic schemes developed and changed both structurally, and materials, and technologies. Not without reason, at the very beginning, when mastering the mass production of the Kalashnikov assault rifle, experts noted the great potential for improvement of the system.
Features of the Kalashnikov brand
The weapon is well thought out, distinguished by relative simplicity and a peculiar elegance of the scheme. Multifunctional parts are widely used, almost perfect alignment ensures the highest reliability of the weapon in any circumstances. AKM continues to fire bursts of bursts when clogged with sand, after swimming in a swamp, and also smeared with mud.
The superbly developed metallurgy of that period, high-quality weapon steel ensured the highest quality of the weapon itself. Also important is the ease of assembly, disassembly and maintenance of Kalashnikov assault rifles, in this respect they have formed a kind of global brand, a standard.
World popularity of AKM
Both machines are very popular all over the planet. They were adopted by the armies of more than fifty-five states. These are mainly Asian, African, Middle Eastern and Latin American countries. In addition, Kalashnikov assault rifles are used by armed forces and police forces in more than a hundred countries, and a dozen states independently produce their own versions of Kalashnikov assault rifles.
7.62mm cartridge for AKM
The 7.62mm cartridge of the 1943 model (7.62 × 39) was developed in collaboration with such designers as: N. M. Elizarov, P. V. Ryazanov, B. V. Semin and A. E. Ryabova. In a standard cartridge equipped with a PS jacketed bullet, there was a steel core. Cartridges can be blank and training. They also have tracer, armor-piercing tracer, incendiary options. The 7.62-mm cartridge of the 1943 model is still produced by dozens of companies all over the planet today.
7.62 mm assault rifles AKMN, AKML, AKMN1, AKMN2, AKMNZ
AKMN assault rifle
AKM assault rifles improved for night fire have a special dovetail bar on the left side of the receiver in order to install illuminated and non-illuminated night sights:
- AKMN, which has an NSP-2 illuminated sight (“with a night rifle scope of the second sample”) and an infrared illuminator;
- AKML - has a NSP-3 sightless sight ("with a night shooting sight of the third sample");
- AKMN1 has an NSPU non-sight sight (“with a night shooting universal sight”);
- AKMN2, which has a non-illuminated universal night sight NSPUM;
- AKMNZ has an NSPU-3 universal night sight.
7.62mm AKMS folding stock submachine gun
In parallel with the AKM assault rifle in 1959, the troops adopted its modification AKMS. It was intended for the weapons of the Airborne Forces, as well as units and subunits of special forces. Its distinguishing feature was the presence of a folding metal stock, the same as the AKC had.
The folding buttstock consists of two stamped rods and a folding shoulder rest, as well as a butt lock, mounted on the left side of the sleeve. In the stowed position, the stops are placed under the forearm. This position does not prevent the holding of weapons and the conduct of aimed fire. All accessories for caring for the assault rifle, unlike the AKM, are worn separately.
The ballistic characteristics of AKMS are similar to those of AKM.
Wooden pistol grips lasted longer on the AKMS than on the AKM. This happened because at the beginning, materials that could have sufficient strength characteristics could not be selected for plastic handles that were not protected from mechanical stress when the butts were folded.
TTX AKM
Caliber - 7.62x39mm.
Length - 880 mm.
Barrel length - 415 mm.
- without magazine 2.93 kg;
- with loaded magazine 3.60 kg.
Shop - 30 rounds.
The initial speed of the bullet is 715 m / s.
Sighting range - 500 m.
Rate of fire - 600 rds / min.
Combat rate of fire - 100 rds / min.
Instead of a conclusion
The design of the proven and highly reliable AKM submachine gun provided this weapon with a long demand and worldwide fame. AKM was and remains one of the best examples of personal small arms on the planet.
If you have any questions - leave them in the comments below the article. We or our visitors will be happy to answer them.
Your attention is presented to the Trigger mechanism (USM) for the AKM assault rifle. Parts are not sold separately.
A little about the lot:
USM trigger, the trigger is hidden in the receiver, its cocking is possible only by retracting the bolt frame back. USM has three sears: the first, made integral with the trigger, keeps the trigger cocked when the trigger is released; the second (singer single fire) holds the trigger while the trigger is pressed in single fire mode. Due to this, an uncoupler is not required; the third (self-timer sear) in automatic fire mode holds the trigger until the shutter closes, the shutter frame provides release from this sear when it comes to the extreme forward position. To reduce the rate of automatic firing, the movement of the trigger after the descent is somewhat slowed down by a special part - the retarder. The mainspring is spiral, the drummer is located in the shutter channel. The fuse, combined with the fire mode translator, blocks the trigger and limits the movement of the bolt carrier.
early production version of the AK with a combined stamped/milled receiver
Modified AK arr. 1947 (mid-1950s issue) with a fully milled receiver.
AKM - Modernized Kalashnikov assault rifle, model 1959, with a stamped receiver.
AKMS - AKM with a folding butt
AKM with a 40mm grenade launcher GP-25
- Caliber 7.62×39 mm
- Length: 870 mm
- Barrel length: 415 mm
- Weight with empty magazine: AK: 4.3 kg., ; AKM: 3.14 kg
- Magazine capacity 30 rounds
- Rate of fire 600 rounds / min
- Practical rate of fire shots / min: single 90-100, bursts up to 400
- Effective firing range: about 400 meters
The decision on the need to transfer the main small arms to an intermediate cartridge was made in the USSR during the Great Patriotic War.
Such a cartridge was created by 1943, and under it the development of a whole family of small arms was started, including a self-loading carbine (SKS), an assault rifle and a light machine gun (RPD). Several designers and teams were involved in the development of automatic weapons on a competitive basis, and among them was a young sergeant M. T. Kalashnikov, who worked at the Izhevsk Machine-Building Plant (IZHMASH). In 1946, Kalashnikov, along with other participants, submitted his own model of an assault rifle to the competition, where he showed good results. For the second stage of the competition, held in 1947, Kalashnikov pretty much redesigned his machine gun, and in a modified form it was recommended for adoption. After initial military trials in 1949, the Kalashnikov assault rifle was officially accepted into service as the "7.62mm Kalashnikov assault rifle, model 1947", or simply AK (sometimes also referred to as AK-47). In its original form, the AK-47 had a receiver of a combined design, assembled by riveting from stamped and milled elements, but this design was not rigid enough, and the AK-47 went into mass production with a fully milled receiver. By 1959, the AK was modified according to operating experience, and in 1959 the AKM assault rifle was adopted - a modernized Kalashnikov assault rifle, distinguished primarily by a one-piece stamped receiver of a smaller mass, a raised butt and a modified trigger mechanism, in the design of which a retarder was introduced trigger actuation (sometimes erroneously referred to as a rate of fire retarder). Together with the AKM, a new bayonet-knife was adopted, which had a hole in the blade. which allowed it to be used in conjunction with a scabbard as wire cutters. Another improvement that appeared in the AKM was the introduction of a muzzle compensator screwed onto the threads on the muzzle of the barrel. Instead of a compensator, a PBS-1 silencer can be installed on the barrel, requiring the use of special cartridges with a subsonic bullet speed. AKM can be equipped with 40mm grenade launcher GP-25. AKM sights have received markings up to 1000 meters instead of 800 meters on the AK-47 (in any case, firing from AK / AKM at a distance of over 400 meters is almost a waste of ammunition).
In 1974, the Soviet Army adopted a 5.45mm rifle complex, consisting of an AK-74 assault rifle and light machine gun RPK-74. However, a significant number of 7.62mm AKM assault rifles are still in service. various genera troops Russian army- I myself, while serving in the Russian Air Defense Forces in 1997-1998, had to shoot from regular 7.62mm machine guns produced in the late 1960s - early 1970s. A considerable number of 7.62mm assault rifles are in service with the Ministry of Internal Affairs and the Russian police.
AK and subsequently AKM were widely supplied to countries and regimes friendly to the USSR, both in the form of finished weapons and in the form of licenses for production, coupled with all the necessary documentation and technical assistance. 7.62mm assault rifles were produced in Bulgaria, Hungary, East Germany, Egypt, Iraq, China, Romania, North Korea, Finland, and were delivered to even more countries. Kalashnikov assault rifles, to one degree or another, served as models for the creation of such systems as Galil (Israel), FN FNC (Belgium), SIG SG-550 (Switzerland) and many others. Civilian semi-automatic versions of the AK are quite popular both in Russia (carbines and shotguns of the Saiga series) and abroad, especially in the United States.
One of the myths associated with the AK says that Kalashnikov "copied" the AK from german machine gun MP-43, also known as Stg.44. Indeed, at first glance, the external layout of the AK and MP-43 is similar, as is the concept of automatic weapons chambered for an intermediate cartridge. Similar outlines of the barrel, front sight and gas outlet tube are due to the use of a similar gas outlet engine (invented long before Schmeisser and Kalashnikov). The disassembly of the AK and MP-43 differs fundamentally: for the AK, the receiver cover is removed, for the MP-43, the trigger box is folded down on the pin along with the fire control handle. The device for locking the barrel is also different (a rotary shutter for AKs against a skewed shutter for the MP-43) and trigger mechanisms. It is likely that Kalashnikov knew about the MP-43, but it is obvious that when creating his machine gun, he was more guided by other well-known models and systems. The main merit of Kalashnikov (or rather, of his entire team involved in the development and debugging of the machine gun) is precisely the optimal layout of already known and proven solutions into a single sample that meets the set requirements.
The advantages of AK are known to all. This is exceptional reliability even in the most difficult operating conditions, unpretentious maintenance, ease of use and maintenance, low cost. Disadvantages, however. are also well known. This,. first of all, the poor ergonomics of all weapons - especially a lot of well-deserved criticism is caused by the fuse translator, which is inconvenient to use and makes a loud characteristic click when switching. Quite rough sights with a short sighting line, they also do not contribute to shooting accuracy, especially single ones. At the same time, all these shortcomings could be easily eliminated, if not in the AKM, then certainly in the AK-74, but the conservatism of military officials, and manufacturers, turned out to be, unfortunately, impenetrable. In general, the AK can be described as an ideal weapon for the long-past World War II, which is not surprising - it was created on the basis of a fresh and very harsh experience of this war. For the modern conditions of conducting local wars and conflicts, the entire AK / AKM / AK-74 family is already largely outdated, but no serious replacement is foreseen yet - the Nikonov AN-94 assault rifle will obviously not replace the AK-74 in the troops.
Technical description of the AKM assault rifle
The AKM Kalashnikov assault rifle is an automatic weapon with an automatic gas engine, magazine-fed and air-cooled barrel.
The basis of automation is a gas engine with a long stroke of the gas piston. The leading link of automation is a massive bolt carrier, to which the gas piston rod is rigidly attached. The gas chamber is located above the barrel, the gas piston moves inside a removable gas tube with a handguard. The bolt frame moves inside the receiver along two side rails, and the design provides for significant gaps between the moving parts of the automation and the fixed elements of the receiver, which ensures reliable operation even with heavy internal contamination of the weapon. Another aspect that contributes to the reliable operation of automation in difficult conditions is the obviously excessive power of the gas engine under normal conditions. This allows you to abandon the gas regulator, and thereby simplify the design of the weapon and its operation. The price of such a solution is increased recoil and vibration of the weapon when firing, which reduces the accuracy and accuracy of fire. The barrel bore is locked by a rotary bolt on two massive lugs engaged with the elements of the receiver. The rotation of the shutter is ensured by the interaction of the protrusion on its body with a curly groove on the inner surface of the shutter frame. The return spring with the guide rod and its base are made in the form of a single assembly. The base of the recoil spring also serves as a latch for the receiver cover. The cocking handle is made integral with the bolt carrier, is located on the weapon on the right and moves when firing.
The AKM receiver is stamped from a steel sheet, with a riveted milled insert in its front part. In early AK assault rifles, the receiver was a combination of stamped and milled elements, in serial AK-47s it was completely milled. At first glance, a milled receiver and a stamped one can be easily distinguished from each other by the shape of the notches above the magazine socket. On the AK-47 with a milled box, these are rather long milled rectangular recesses, on the AKM, these are small oval stampings.
Trigger mechanism (USM) AKM - trigger, provides single and automatic fire. The choice of fire modes and the inclusion of the fuse are carried out by a long stamped lever on the right side of the receiver. In the upper position - "Fuse" - it closes the slot in the receiver, protecting the mechanism from dirt and dust, blocks the movement of the bolt frame back, and also locks the trigger. In the middle position, it blocks the sear of a single fire, providing automatic fire. In the lower position, the single fire sear is released, providing fire with single shots. In USM AKM, unlike the AK-47, a trigger retarder has been introduced, which, during automatic fire, delays the release of the trigger after the self-timer has been triggered for a few milliseconds. This allows the bolt carrier to stabilize in its forwardmost position after it has come forward and possibly rebounded. This delay has practically no effect on the rate of fire, but it improves the stability of the weapon.
The machine guns are fed from box magazines with a two-row arrangement of cartridges. The standard magazine capacity is 30 rounds. early magazines were stamped steel, with flat sides. Later, steel stamped magazines appeared with vertical curved undercuts on the sidewalls to increase rigidity. Then, plastic magazines of a characteristic dirty orange color appeared in the troops. If necessary, 40-cartridge horns and 75-cartridge discs from the RPK light machine gun can be used in the AKM.
On early assault rifles, the handguard, pistol grip and buttstock are wooden, the buttstock has a steel butt plate with a lid that covers the compartment for accessories for cleaning and maintaining weapons. On the AKM, the stock comb was raised up to reduce the toss of the weapon when firing. On some machine guns, the pistol grip is made of plywood or plastic. AK and AKM are equipped with a bayonet-knife in a sheath and a gun belt. Modifications of the AKS and AKMS assault rifles, specially designed for the Airborne Forces, had folding butts made of stamped steel. Such butts folded down and forward, under the receiver, accessories for such machine guns were worn separately.
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