Dual Sector Gears: What Are They, and How do They Work

March 3, 2015

If you watch YouTube videos, I am sure you have seen videos on dual sector gear (DSG) guns, and their quite unrealistic rate of fire. If you are not familiar with the workings of a gearbox, you may be wondering: how on earth can a gun shoot that fast? The concept is actually quite simple, in terms of how it works. In this article I will explain the differences between a single sector gear (SSG) and a DSG, with pictures to help you understand the difference in looks.

Let’s start with the SSG seen below. This is your standard 16 tooth sector gear. This means there are 16 teeth that are used to pull the piston back. Each time this rotates around in the gearbox, it is one complete cycle.
With a DSG, you are not actually running two sector gears as the name would suggest. Rather, it is more like a dual cycling sector gear. There are two sets of teeth, so if you are shooting on full auto, one complete revolution of the sector gear will give you two shots essentially. If you notice on the DSG below there are 8 teeth per cycle, which is half that of the SSG and they are positioned on opposite sides of each other.

The concept of this is fairly straight forward. Because you have half the teeth (per cycle) than that of a SSG, it will increase single fire trigger response. Why? Because the motor and gears are only pulling the piston back half way than that of a SSG. A SSG allows the gear to cycle faster. It is the same with full auto; the gear is giving you two cycles per revolution, so it will cycle twice as fast (at least).

With a DSG, the spring plays a huge role. Because there are only 8 teeth on the DSG (in this example), it would make sense that you would need a heavier spring, right? Yes, because the more you compress a spring, the harder it will spring back at you. Likewise, since the DSG is only pulling the piston back half way, we want a heavier spring to compensate, which is why you see M180 springs in DSG builds.

The concept of DSG is definitely interesting. If done right, you will feel like you can take on the entire opposing team on the airsoft field. Needless to say, it is extremely expensive to build one because you want to make sure you have the highest quality parts possible. Aside from that, if you are paying someone to build one for you, they will charge a pretty penny. If you are considering a DSG for your gun, give us a call and we can help you out.

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