Colt submachine gun based on AR rifle

△ Colt submachine gun

The 9mm colt submachine gun was developed in the early 1980s. At that time, Colt Company had developed a variety of 5.56mm AR- 15 rifles, and they were lying on the orders of the American government, with their mouths full of oil (of course, they didn't expect to go bankrupt in a few years and were sold to Czech CZ Company). After a great success in the field of rifles, Colt decided to launch a submachine gun based on the basic structure of AR rifles to launch pistols. At that time, the market was dominated by MP5 submachine guns of HK company, so when Colt company proposed to develop submachine guns, many people were not optimistic about its market expectation and found it difficult to compete with MP5.

△LAPD special police model was sealed. At that time, the special police of various law enforcement departments were still using a large number of MP5 submachine guns.

However, the later development was unexpected, because the AR- 15 series rifles in the United States have a very wide range of users, including people from the military and law enforcement departments, who have a strong psychological dependence on the operation mode of AR rifles. Therefore, when the Colt submachine gun appeared, the operation mode was exactly the same as that of the AR- 15 rifle, and the weapon that fired the hand bullet was identified at once, so the Colt submachine gun was almost unified.

The colt submachine gun is based on AR- 15, specifically the Commado model with short barrel of AR- 15. The caliber is changed to 9mm, and the 9x 19mm Parabellum pistol is fired. The chamber pressure of 9mm Parabellum pistol is lower than that of rifle bullets, so it can be held by the simplest principle of free bolt machine. Therefore, the original AR- 15 air blowing and air guiding mechanism and rotary locking bolt are cancelled and replaced by loose bolts. Because of the principle of free bolt, there is no situation that the bolt rotation locking is not in place, so the 9mm colt submachine gun is no longer equipped with an auxiliary gun pushing handle.

The 9mm colt submachine gun keeps the characteristics of the original AR- 15 as far as possible in places such as stock, handle, sight and magazine well. Even if the 9mm magazine was changed, the opening at the bottom of the magazine well was still very large, which was convenient for inserting the magazine, but the appearance was very uncoordinated. Many people think this magazine well with 9mm magazine is particularly ugly. Colt submachine guns have two kinds of magazines with capacities of 32 rounds and 20 rounds respectively.

△ The right view of Colt submachine gun, the appearance is almost the same as that of short-barrel AR rifle, the main difference is the magazine.

△ The removed Colt submachine gun barrel is almost exactly the same as the AR rifle barrel, except for the lack of airway.

△ The bolt of the Colt submachine gun is the same as the trigger. Compared with the rifle, its bolt is not as locked as the nose.

The principle of the free bolt is that the bolt directly recoils under the action of chamber pressure, and the shell extraction time is earlier than that of the air-guided rifle bolt, and some unburned powder gas will be ejected backward with the thrown empty shell. Therefore, there is a horn-shaped baffle behind the shell-throwing window of the Colt submachine gun, which blocks the thrown empty shell and bounces it forward, just like the projection of the guide shell behind the shell-throwing window of the M 16A2 rifle.

△ Close-up of the horn baffle behind the shell throwing window of Colt submachine gun

There is also the principle of free bolts. Because of the high recoil speed of the bolt, although the pistol bullet with lower power is fired, the recoil impact of the bolt is more violent than that of the air-guided AR rifle, and the gun body is lighter, so the recoil impact of the Colt submachine gun is greater than that of the rifle. Some people criticized the gun for repeated firing, but fortunately, the colt submachine gun inherited the straight stock design of AR- 15, and the recoil was transmitted along a straight line, so the shock returned to the shock, the muzzle jump was not too big and the maneuverability was good.

△ Chug Chug ... The vibration is not small, but the beating on the muzzle is not big.

There are many types of colt submachine guns, such as model 635 with M 16A 1 safety-single-firing trigger group, model 639 with M 16A2 safety-single-firing trigger group, and model 91wooden guard with flat top shell.

△ colt 9 1 1 submachine gun, flat-top shell, wooden protection of guide rail.

Because the operation mode is highly similar to the ar rifle, it satisfies the psychological dependence of a large number of unhappy people in the United States. Therefore, colt submachine guns are widely used by many federal, state, county and municipal law enforcement departments and military units such as the Marine Corps Ship Anti-Terrorism Security Force (FAST).

△ American law enforcement officers using Colt submachine guns

There is also a colt submachine gun model with a shorter barrel, that is, the model 633 with a 7-inch ultra-short barrel, which was introduced in 1990. It was originally developed for DOE NEST of the Department of Energy and can be carried in a backpack. Type 633 wood guard is simpler, and there is no anti-slip line. The triangular quasi-constellation with AR characteristics and the muzzle flame arrester are cancelled and replaced by collapsible quasi-constellation, and there is a hand guard behind the quasi-constellation to prevent the finger from accidentally riding in front of the muzzle when shooting with a gun.

△ 633 colt submachine gun shorter than 653, with shorter and simpler wooden protection and muzzle hoop as quasi-constellation.

△633 Close-up of unique muzzle shape

Colt submachine gun, the design of changing rifle caliber into pistol caliber, is obviously very successful. It has won a place in the American civilian weapons market and left a deep impression on quite a few military and police forces. After all, there are too many unhappy gunmen in America. Of course, in order to circumvent the relevant laws on gun management in the United States, the civilian version of the Colt submachine gun is semi-automatic, and the barrel length is 16 inch. During the entry into force of 1994-2004 Law on Prohibition of Offensive Weapons, the bayonet seat of the civil version of Colt submachine gun was also cancelled (the bayonet seat was a part of the quasi-constellation, which could have been used as a ready-made part, and in order to circumvent the law, only a quasi-constellation without bayonet seat could be produced separately). In order to avoid "evil functions" (telescopic/folding stock, independent grip, muzzle flame arrester, bayonet seat, etc. Whether it is all included in the "evil characteristics" of the Law on the Prohibition of Offensive Weapons, the newly produced civilian guns cannot exceed two), and the magazine capacity is also reduced to 10 rounds.

△ Switch to 16 inch long barrel and semi-automatic Colt 6450 carbine.

Because this weapon can't fire a pistol with both hands, it is a bit reluctant to be called a "submachine gun", so later this weapon has a special name called pistol caliber carbine (PCC). The pistol caliber carbine is simple in structure, low in price, and the recoil of the pistol bullet is relatively small, and the short-range power is basically enough, so it is very popular among American folk gunmen. It also drives some law enforcement agencies to equip PCC as a pike on patrol police cars, because it can be used as ammunition for police pistol and is easier to control in combat. In the practical shooting competition of IPSC, there are also carbines with pistol caliber.

△ Some law enforcement agencies in the United States are also interested in the AR architecture PCC.