Jaeger Precision walks us through the conversion of an Ares M45 X-Class airsoft gun to use a Polarstar Jack HPA engine. The conversion faces challenges due to the unique gearbox design, particularly the ambidextrous fire selector and hall effect sensor system. Modifications include adapting the Polarstar's trigger board, reassembling the gearbox, and modifying the pistol grip and stock. After assembly, the gun successfully fires with a faster rate than before.