Performance of M 16 rifle. Characteristic rifle is mainly composed of upper shell component, lower shell component and bolt assembly. The upper shell assembly comprises a barrel, a sight, an air duct, upper and lower guard plates, a muzzle flame arrester, a barrel connecting hoop, a dust cover, a handle, an upper shell and the like. The lower shell assembly comprises a gunstock, a grip firing and launching mechanism, a safety mechanism, a return spring guide tube, a return spring, a lower shell and a shell connecting sleeve, etc. Bolt-frame assembly includes loading handle, bolt locking guide post and its fixing lock, bolt, shell lifter, frame, etc. The firing mechanism is hammer rotary. The striker has no striker spring. When firing, the firing pin hits the tail end of the bolt with an annular protrusion to ensure the normal protrusion of the firing pin. During the unlocking process, the annular partition on the frame drives the striker to move backwards. Before the frame re-enters but does not complete the free travel after locking, the annular partition restricts the striker from moving forward, and can only fire after the machine gun is locked. The launching mechanism only has single shot and continuous shot, not three shots. The trigger holder can be opened downwards, which is convenient for soldiers to shoot with leather gloves/cotton gloves. The reducer handle has three positions: single shot, continuous shot and safety. By changing the position of the reducer handle, the launching mechanism can directly control the hammer. The fixed triangular straight butt, square guard and handle of the gun are all plastic, and many important parts are aluminum alloy. Its performance features are as follows: (1) In order to give full play to the power of 5.8 mm bullets, the barrel has enough length. The structure without support is adopted, which shortens the length of the whole gun (rifle 746 mm, machine gun 840 mm). Ammunition replenishment tools are universal, with large ammunition capacity, continuous firing and continuous firepower. (2) The whole gun is short, light in weight (3.25 kg for rifle and 3.95 kg for machine gun), and has good maneuverability, which is superior to similar foreign weapons. (3) The recoil of the 5.8 mm bullet is small, the dynamic characteristics of the whole gun are stable, the overall layout is reasonable, the gun is comfortable to aim at, the vibration is small, and the accuracy of single point and point firing reaches a high level. (4) The mechanism has reliable action, can adapt to various climatic and environmental conditions, and has long service life, which is superior to similar foreign weapons. (5) The basic structure of each gun in the gun family is the same, most parts are universal, and moving parts such as automatic machine and ammunition feeder are interchangeable, which is very convenient for service use and maintenance. (6) There are mechanical aiming devices and simple night aiming devices, as well as white light aiming devices and low light aiming devices, which can adapt to all-weather operations. (7) One gun can do many things, and there are many guns in one family. This family's rifle can be hung with a 35mm Grenade launcher, and it can also fire bullets at the muzzle, which has expanded the killing ability across the point. Equipped with multifunctional bayonet and scabbard, it is easy to carry, has the functions of stabbing, chopping, shearing, sawing and cutting, and can also be used as a dagger, which expands the tactical role of the rifle. In addition to rifles and machine guns, the new gun family also has short rifles (the total length of the guns is 560 mm and the total weight of the guns is 2.8 kg) and folding stock, which realizes multiple guns in one family and can meet the needs of personnel in various arms and services. (8) The extensive use of new materials, such as engineering plastics and hard aluminum alloy, is of great benefit to improving the appearance of the whole gun, improving the anti-corrosion ability, reducing the quality of the whole gun and simplifying the production process. (9) According to different parts, advanced technologies such as black phosphating, anodic oxidation and full-color plastic spraying are adopted to improve the anti-corrosion and anti-decoloration ability, which completely solves the problem of poor anti-corrosion ability of the original Type 56 weapon. (10) has carried out reform and innovation in manufacturing technology, adopting new technologies such as precision forging barrel, hot die forging aluminum shell and plastic injection molding, and making more use of CNC machine tools and machining centers to process key parts, thus ensuring the machining accuracy requirements and realizing the complete interchange of assembly parts.