Manual machine guns family Steyr AUG
The first light machine gun of the family was the AUG HBAR (Heavy Barrel - "Heavy Barrel"), which is a basic automatic rifle with some changes due to other requirements. The main differences between the machine gun and the base rifle are a different barrel and a larger capacity magazine. All other parts and assemblies of weapons are unified. Moreover, by replacing the barrel, the Steyr AUG can become an AUG HBAR light machine gun and vice versa.
The main part of the AUG HBAR machine gun is a receiver of a characteristic shape, made of aluminum alloy and placed inside a plastic case. To increase rigidity and strength in the design of the receiver, there are several steel inserts. One of these parts is used for fastening the barrel and locking the bolt. The thick-walled 5,56 mm caliber barrel, 621 mm long, as well as the other AUG trunks, is mounted in the receiver with eight stops included in the grooves of the receiver and fixed by turning around its axis. The breech of the trunk is equipped with a gas block with a piston, as well as a fastening assembly of the front handle. For ease of use, the barrel is set muzzle brake and folding bipod.
Automatic machine gun AUG HBAR uses the energy of powder gases discharged from the barrel. A short stroke gas piston drives the bolt group. Before the shot, the barrel is locked onto seven lugs by turning the bolt. In this case, the lugs are not located on the trunk, but on a special coupling, to which the barrel is attached. The bolt group moves in two hollow tubes. In addition to holding the bolt group, they perform additional functions: the left tube connects the bolt to the cocking handle, and the right one serves as the gas piston rod. For the extraction of spent cartridges the shutter is equipped with an ejector and a spring-loaded reflector.
An interesting feature of the machine gun of other weapons of the Steyr AUG family is the possibility of using two different bolts for right-handed and left-handed shooters. The shutter for firing from the right shoulder throws out the cartridge cases through the window on the right surface of the receiver. The second version of the shutter has a “reflected” design and throws the sleeves to the left.
The trigger mechanism of the machine gun is made in the form of a separate unit located in the butt. USM is connected to the trigger with two rods. In the design of the firing mechanism of the Steyr AUG automatic rifle and weapons on its base, several interesting technical solutions were used. So, the majority of parts USM are made of plastic, and the number of metal parts is minimized. In addition, the mechanism does not provide a separate translator of fire. The functions of the translator are performed by the trigger: with an incomplete pressing, a single shot is made, and for firing with a burst it is necessary to fully press it. As a fuse button is used above the handle of fire control, blocking the trigger.
Used automation allows you to shoot at a rate of up to 680 shots per minute. The initial speed of the bullet due to the use of a relatively long barrel reaches 950 m / s. The effective range of fire - not less than 350-400 m. Aiming is proposed to produce using an integrated sight. The optical sight with multiplicity 1,5x is built into the carrying handle and is similar to the sighting devices of other weapons of the AUG family.
The machine gun is powered from detachable box magazine on 42 cartridge 5,56х45 mm NATO. In addition, it is possible to use magazines on 30 cartridges, originally intended for the AUG automatic rifle.
Due to the use of a long 621-mm barrel, the total length of the Steyr AUG HBAR light machine gun is equal to 900 mm. Weaponless ammunition weighs 4,9 kg. Thus, the light machine gun is only 100 mm longer and kg 1 heavier machine, on the basis of which was created. Such dimensions and weight, as well as a high degree of unification contribute to the ease of use of the AUG HBAR machine gun in various divisions.
Manual machine gun Steyr AUG HBAR coped well with the implementation of the tasks assigned to it, but had some drawbacks. The main one is the tendency to overheat the barrel during intensive shooting with corresponding consequences for the accuracy and accuracy of fire. To solve this problem, an AUG LMG light machine gun (Light Machine Gun) was created. Again, the design changes were minimal, which made it possible to maintain at a high level the degree of unification of the two types of weapons. In fact, adjustments were made only to the trigger mechanism and sights.
To reduce the thermal loads on the barrel in the project AUG LMG, a new trigger was used, intended for firing from an open bolt. This means that before the shot the shutter is held in the rearmost position and returns forward, to the sending cartridge, only after pressing the trigger. Due to this, between the shots and during the breaks in the shooting, the chamber is open and the barrel can cool down faster, transferring heat more efficiently to the surrounding air. In addition, shooting with an open shutter allows you to increase the rate of fire. With a similar design to the AUG HBAR machine gun, the AUG LMG can do up to 750 rounds per minute.
In the handle for carrying the machine gun AUG LMG is a new optical sight 4. The use of the new sight allowed us to simplify aiming at long ranges. At the same time, the firing range remained the same - over the 350-400 m.
AUG HBAR-T and AUG LMG-T light machine guns have responded to the demands of the times. The only difference between these weapons from HBAR and LMG is the new carrying handle. In order to increase the flexibility of use, the pen with an integrated telescopic sight was replaced with a Picatinny rail for attaching any compatible sight. A handle with a bar for mounting scopes was borrowed from a modification of the basic AUG P Special Receiver.
One of the main advantages of the Steyr AUG family of weapons is its modular design. Depending on the current tasks, the shooter can use the most suitable barrel and bolt. In particular, the procedure of replacing individual units makes it relatively quick and easy to make an automatic machine gun AUG with a HBAR or LMG light machine gun. This feature of the machine gun family AUG interested some customers. Military and security forces of several countries purchased a number of light machine guns of these models in the form of finished products and sets of replaceable modules for use with machine guns.
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