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WHAT IS A COMPENSATOR OR muzzle BRAKE AND WHAT IS IT FOR?

A stroke compensator is a special device that is installed on the thread of the muzzle of the barrel. Its purpose in firearms is to reduce the stroke of the weapon when fired. Its variant is the muzzle brake, which directs the direction of the flow of gases from the barrel and thus reduces recoil. The most common devices sold today are a combination of a muzzle brake and a compensator. These can be collectively referred to as stretch devices.  

In the world of airsoft, recoil devices have only aesthetic significance. However, some devices can also serve as a lock for the suppressor, following the pattern of real-life models, where the suppressor is classically screwed onto the barrel but then locked in place using a lock. Such stretch devices are sold together with a silencer of the given locking design.

Our advice: Since airsoft "comps" and other stretch devices are based on real firearms, it is important to pay attention to its correct position for proper visuals. In the case of a combo device, it must be installed with the large ribbing pointing to the side and the small holes pointing upwards. Only then will such a device look believable on an airsoft gun and perform its function correctly on firearms.

WHAT ARE THE THREADS ON THE BARRELS?

As far as the threads are concerned, there is no one universal type, but there are a large number of them, precisely because of the internal diameter of the barrels, which vary due to the different diameters of the bullet projectiles. But this only applies to firearms. 
In airsoft, the inner diameter is not important because the inner barrel passes through the outer barrel and they have the same outer diameter +-.
Most often we encounter the designations CCW and CW. We will explain what this means below.

• CCW can be translated as left-handed thread. This means that it is tightened counterclockwise.
• CW is a right-hand thread, so it tightens in a clockwise direction.

There are actually a huge number of threads themselves. Therefore, below we will list the most common types of airsoft threads and also where they are most commonly found. As a bonus, we will also list the most common types of threads for edged weapons.

Threads on airsoft guns have slightly different dimensions than real guns. The most common types we see are:

Bonus: For real weapons, the following types of threads are most commonly used:
1/2x28 ( ar15, 9mm pistol)
.578x28 for 45.acp
5/8×24 for larger caliber repeating rifles like 308 Win. 

Our tip: Any compensator must be screwed onto the barrel. Once screwed in, the compensator must be secured against loosening to do this either threaded glue or better yet a deformation washer called a Crush Washer is used. Compensators are often equipped with a small worm for fixing. With "airsoft" it is not necessary to use a lot of force to screw on these stretch devices but, for example, also the dampers. 
On AK platform guns, the compensator is screwed onto the thread and secured at the end by a small spring-loaded pin located in the base of the sight. This prevents the device from loosening on its own.

In our offer you can find compensators of various shapes and types of brands 5KU, Retro Arms, SHS and others, so that you can assemble your airsoft replica in your own image!