Airsoftjunkiez has this video showing how to install the PolarStar Airsoft F1 HPA Engine... "Polarstar F1 Installation in a GG CM18 Mod1. Installation is identical to the Polarstar jack system. Other cylinder replacement systems are very similar if not identical installation preceedures such as Wolverine Airsofts SMP and Inferno System for V2 gearboxes."
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