Gunstock Metal Powder Injection Molded Parts

Introduction of MIM stock parts

Gunstock is one of the important parts of the gun, located at the end of the gun. Gunstock Metal Powder Injection Molded Parts is used to effectively slow down or offset the impact force produced by the burning of gunpowder in the barrel when firing, so as to maintain the balance of the gunman when shooting . The gun stock has a long history of development along with the gun. Today, the editor of Zhongwei Precision will talk about it.

The development of gun stocks

In the 14th century AD, mankind's first thermal weapon, the arquebus, appeared. Although this gun now looks less like a weapon and more like a fire stick, it was a weapon that completely changed warfare at that time. There are also many changes in the wooden stock used at this time, such as the triangular stock commonly used by the Arabs, the handle stock used in the Qing Dynasty, and so on.

●India's original arquebus was like a burning stick

Although guns are constantly progressing and developing, until World War II, the guns produced in various countries in the world still use wooden buttstocks, such as Kar98k, M1 Garand rifles and so on. There are two main reasons: First, limited by the level of metal smelting at that time, if all guns are to be forged with metal, the consumption is huge, and heavy weapons such as aircraft, tanks, and cannons also require a large amount of metal. , so good steel needs to be used on the blade. Second, the level of gun manufacturing at that time was not high. The front-line soldiers used long rifles with a length of more than 1 meter. If too much metal was used, these 1-meter-long guys would be too heavy and difficult to use.

Of course, the use of wooden buttstocks also has many advantages. First, of course, it is light in weight, which can greatly reduce the burden on soldiers. Second, it is not easy to conduct heat. When the environment is cold, it will not be too cold to use. It will not be hot; the third is low cost, although wood is more easily damaged than metal, soldiers can also easily replace and repair.

●M1 Garand Rifle

However, the outbreak of World War II has brought weapons and equipment into a period of rapid development. At this time, many guns are all-metal guns, such as the British Sten submachine gun and the German MP40 submachine gun. The types are relatively rare, and they are generally used for submachine guns and other body types. smaller gun.

●Stocks of modern materials

After World War II, most guns still use wooden stocks, such as AK-47 assault rifles, until the breakthrough in materials science has made the stock a great improvement. Before the advent of synthetic materials, most humans used a single material or a simple mixture of several materials, and little was known about the microscopic properties of the materials used, but this has been greatly transformed after the emergence of polymer materials.

●The Sten submachine gun uses a metal stock

Gunstock Metal Powder Injection Molded Parts are strong and durable, and the wooden stock is light and thermally insulating. It would be perfect to have the advantages of both materials without their disadvantages. Synthetic fibers and engineering plastics do just that. .

The Steyr AUG assault rifle is the first firearm to use engineering plastics. Except for the barrel, most of the gun body is made of engineering plastics. This material is not only light and durable, but also resistant to high temperatures. It is very suitable for manufacturing The butt, and the French FAMAS automatic rifles in the same period. Since then, most gun stocks have been made of modern synthetic materials.

●AUG is one of the first weapons to use engineering plastics

●The construction and shape of the stock

Generally speaking, the stock is divided into three categories. The first category is the single-piece stock, that is, the stock is made of a whole piece of wood. This type of rifle was basically used in the early days. According to the extent of the wood extending to the muzzle, it can be divided into full stock and half stock. The original intention of this kind of gun stock is to protect the barrel to the maximum extent, but it was later found that this structure will affect the shooting accuracy for a long time, and the fully covered wood will squeeze the barrel during the accumulated deformation, so after World War II The monobloc stock has been eliminated, and only the civilian field and a small number of military fields still use the semi-stock structure in the monobloc butt.

▲The above pictures are all single-piece buttstocks, except that the above is a full-stock structure. This structure was relatively common before World War II and has basically disappeared in modern times. The following is a half-stock structure, which is compared in the field of civilian or military sniper rifles common.

After that, there is a double-body stock, which is a metal gun body that divides the stock into two parts, front and rear. This structure is widely used in the field of shotguns. Later, a grip independent of the stock appeared, which is what we are now. The most common military rifle structure, this is the three-body stock. The stock of this construction is flexible and practical, making it ideal for assault rifles.

The double-body stock divides the stock into two, and the three-body stock has an independent grip, which is basically the structure of modern assault rifles.

When the soldier is aiming, the butt rests on the shoulder, the eyes and the sight line are in a straight line, in order to achieve this, the best way is to bend the butt down. If the stock is too high, the soldier can only roll his eyes when aiming, which is especially uncomfortable. However, the curved stock has an inherent disadvantage, that is, the recoil force and the shoulder force are not in a straight line, so that the muzzle will be subjected to an upward resultant force. This shortcoming is not obvious on the manual bolt-action rifle. Later, the continuous automatic rifles gradually showed up. The most famous one was the AK-47. The downwardly curved butt caused the AK-47's muzzle to jump up very seriously. The first shot was still accurate. The ballistic will float upwards. Later, countries basically abandoned the curved stock and adopted a straight stock with recoil and shoulder force on the same straight line. The problem comes again after the straight stock is adopted, that is, the gunner's eyes are higher than the sight line. Some countries use the method to increase the height of the rear sight and front sight (such as M4A1 and our country's 95 type), but in this way, the soldier's head There are more parts exposed, which is very dangerous. There are also countries that do not raise the rear sight and crosshair height (AKM and Japanese Type 89), so that soldiers can only roll their eyes upwards when aiming.

▲The curved stock is very suitable for aiming, and the exposed area of the head is small, that is, the muzzle jumps seriously

▲Speaking of curved butt and straight butt, the AK-47 and AKM brothers are the best examples. AK47 is a curved butt, so the muzzle jumps very seriously. AKM has been improved to a straight butt, recoil and shoulder The force is in a straight line, so the AKM's muzzle jump is not very serious, but the AKM does not improve the sight and the rear sight after using the straight stock, and the shooter is awkward when shooting against the shoulder.

Since there are up and down bends, there must be left and right bends, because the stock of the gun is very comfortable when the gun is fired on the shoulder (excluding lefties), but the muzzle will jump to the left when the fire is fired, so modern assault The stock of the rifle does not have a right deflection angle. In some single-shot competitive guns, there will be a certain right deflection angle, but it is so small that it is difficult to distinguish it with the naked eye.

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