Which has better comprehensive performance, AKM or AK74M?

Kalashnikov improved the AK-47 from 1953 to 1954, and finally finalized it as AKM. 1959 was equipped by the Soviet Union. The main feature of AKM is to replace AK-47 3 milling machine case with punching and riveting case, which greatly reduces the production cost. Moreover, the new punching machine case is lighter than the punching machine case of AK-47 1 and the milling machine case of Model 3, and the improved AKM weighs only 3. 15kg. AKM is called avtomat Kalashnikov modernizirovanyi, which is an improved version of kalashnikov rifle. This weapon has become the most productive and influential AK gun so far.

The earliest stereotyped AKM was adopted by the Soviet Union in 1959, with the following improvements:

1. The weight of the rifle is reduced, mainly by using a large number of stamping parts and changing riveting into welding. For example, the gun barrel sleeve and tailstock are spot-welded on the U-shaped chassis with a thickness of 1mm, and the bracket bolt guide rail is also a stamping part, which is spot-welded on the inner wall of the chassis; The magazine was changed into light alloy, which can be used with the original steel magazine. In the later stage, the magazine made of FRP was developed, and it can also be used completely. The stock, guard plate and handle are made of synthetic resin.

2. The surface of the bolt and the bolt bracket is phosphatized, and the front end of the piston cylinder has four semicircular notches, which are just matched with the notches of similar air guide hoop; There is a small magazine positioning slot on both sides of the chassis, and there are reinforcing ribs on the chassis cover.

The hammer is equipped with a five-part hammer delay, which is located near the trigger.

4. The scale range has been increased. The scale is divided into 200 ~ 1000 m, and one is divided into 200 m; Both the cylindrical sight and the U-notch photoelectric door have reversible accessories, which contain fluorescent material radium 22 1 for aiming at night.

5. Use a new multifunctional bayonet (type 2 bayonet).

6. There are finger grooves on the guard wood, which is convenient for the shooter to control the weapon when shooting repeatedly.

The biggest difference between Type 3 AKM and Type 1959 AKM is the design of oblique notch muzzle anti-jump device, which is screwed on the muzzle to improve the dispersion accuracy during continuous firing, and the length of the whole gun is increased to 880 mm, just like the case of AK-47. Because Type 3 AKM is widely equipped by Soviet troops and other eastern camps, some people mistakenly think that AKM must have oblique notch anti-jump device.

In addition, a new bayonet (type 3 bayonet) was designed for this model, and the shape of the handle was changed. The plastic handle and scabbard were used for the first time. At present, most of the AKM we see are of this type with anti-jump devices. Later, many modifications of AKM were based on this type. Among them, AKMC is a folding metal stock (AKMS in English), and there are two kinds of folding stock: one is made of two poles and folded under the case, which is a common AKMS model; The other is folded to the right side of the shell with a reinforced protective device in the middle. AKMH (English AKMN) is a model with night vision sight, and short barrel AKMCY (AKMSU). After the Soviet army was equipped with AKM, other Warsaw Pact countries also began to equip.

The earliest AK-74 was developed for mechanized infantry, and it was finalized in 1974. AK-74 is based on AKM, and their principle, locking mechanism and ammunition supply mode are exactly the same as those of firing and launching mechanism. However, in order to launch a small-caliber 5.45mm M74 bomb, the machine gun, bolt machine and air guide hoop were improved accordingly. Among them, the winding distance of barrel rifling is shortened, which makes the warhead rotate at high speed and fly stably. In addition, the diameter of the gun body is also reduced accordingly, so that the weight ratio of the gun rack to the gun is increased to 6∶ 1(AK-47 is 5∶ 1). The advantage of this proportion change is that the rifle automatic machine is more reliable when shooting, but the disadvantage is that the strength requirement of the shell pulling assembly is higher, so the parts with high strength requirements such as the gun rack and shell pulling hook are redesigned. In addition, AK-74 also chrome-plated the gun bore and added an efficient muzzle device, which is the biggest difference in appearance between AK-74 and AKM.

The new muzzle device is cylindrical in shape, fully machined, 8 1mm in length and 25.8mm in diameter, and has a double-chamber structure inside. Two sides of the front cavity are respectively milled with a large square opening, and the back section of the opening is provided with a sawtooth groove; The posterior chamber has three pores with a diameter of 2.5 mm, which are distributed on the upper surface and the right side. According to the principle of gas dynamics, the gunpowder gas ejected from the muzzle is impacted and expanded twice in this muzzle device. When the gas passes through the rear cavity, part of the gas is ejected from the three exhaust holes of the rear cavity to achieve the comprehensive functions of braking and shock absorption; When passing through the front cavity, the groove in the rear end face of the big opening will make the gas flow 25 degrees, so that enough gas will recoil on the front end face of the opening, further reducing the recoil force. In addition, spraying air to the upper right can reduce the jump when shooting at the muzzle, which is also conducive to improving the shooting accuracy. Due to the low recoil of small caliber ammunition and the function of this muzzle device, the accuracy of AK-74' s burst and dispersion is greatly improved. However, although this kind of brake has obvious braking effect, it still has a disadvantage, that is, the muzzle flame will be more obvious, especially when shooting in the dark.