The bucking is an often forgotten part of the Hop-Up that is so important to the functioning of any high-end Gas gun. To put it simply, the bucking might just seem like a piece of rubber found inside the hop-up chamber of an airsoft gun. However, when equipped with a hop-up, airsoft guns can achieve much greater range than an equivalent with the same barrel length. This is because of the backspin that the bucking puts on the projectile as it exits the barrel. This principle remains true for any propulsion system, and bucking is also key in adjusting a hop-up to meet the exact specifications of an Airsoft Gun as needed.

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