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anti-siphon system
Sometimes with rifles where the bolt securing the buffer tube screws directly into the back of the engine
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Fire Control Unit, Rev. 3, Universal Long sleeve Tshirt anti-siphon systemThe REV3 FCU follows the classic design of our very first FCU and it is considered to be the finest fire control units on the market. Since it is equipped with an LCD screen and joystick you are able to easily scroll through menus and precisely adjust settings for the utmost control over the system. This FCU is also universally compatible with all PolarStar HPA systems including both dual and single solenoid systems. This latest REV3 model features