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Polarstar Fusion Engine Kit V3 GEN3 AK The Fusion Engine™ is an HPA powered, solenoid driven, electronically controlled drop-in replacement for an AEG's gearbox. Its purpose is to take on the role of any high performance gearbox in one reliable and easy to use package. Specs.: FE Profile: Version 3 Included FE Nozzle Type: AK series, Blue Included...