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Direct impingement
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== Variables == The operation of the system is highly dependent on both the length of the barrel and the gas tube which transports gas from the barrel to the bolt. Using too short a gas tube can result in increased pressure inside the bolt assembly and an increased rate of automatic fire, both of which can negatively affect the weapon and accuracy of shots. The use of a [[suppressor]] also increases gas pressure, further aggravating the situation. The problem can be reduced by using a longer gas tube, moving the gas port on the barrel further forward, and/or by installing an adjustable gas block to provide the right amount of gas pressure depending on the desired operating mode.<ref name=web/>
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