PolarStar Jack HPA Engine (M249)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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