Polarstar JACK - HPA Standard FCU Conversion Kit

The Polarstar JACK - HPA Standard FCU Conversion Kit. This is the full sized FCU version for easy programming. Contains everything you need internally. Works drop-in with most M4/AK platforms. G&G, Elite Force, JG, and most are pretty easy to install. Watch some Youtube videos on how to put it in yourself. With the Polarstar JACK engine, all you need to complete your HPA setup is: HPA Air Tank (non-SLP tan regulator is okay, Ninja, Valken, FS is good) Air line regulator (non-SLP) - Wolverine, Valken, Ninja are all good Air line from the regulator to the gun/engine 7.4v 250mah battery to power the engine (plus LiPo charger) That's it! Speedsoft gold!