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Spin up or Hop up is when a bb is shot from an airsoft gun, there is a friction placed on the upper side of the bb while exiting the barrel. This friction causes the bb to "spin upward" or a backwards / under spin. This mechanism is called the Hop-Up. The Hop-Up configuration determines the range of bbs or extend the effective range of an airsoft rifle. Most spring airsoft guns come equipped with "built-in" Hop Up which is not adjustable nor calibrated. However, higher end models, such as gas airsoft pistols and electric airsoft rifles can be adjusted or calibrated both to the type of BB being used and the flight path desired. The below diagram illustrates the effects of hopup and how to callibrate your airsoft gun correctly. Towards the bottom of diagram it coveres the bernoulli's principle and it's effect on the path of a BB with hopup.

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14y ago

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