PolarStar Jack HPA Engine (V2-M4)Code Name "Simple Jack" The JACK was designed to answer the demand for an affordable, high performance HPA (High Pressure Air) conversion for AEG's. The system is a drop in cylinder replacement that is universally compatible with a wide range of gearbox versions that have center line nozzles. PolarStar Filter Fitting now included! Similar to its sister products, the JACK replaces the original gearbox components with a programmable pneumatic system
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