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Aggressive 360 texturing to increase surface traction but strategically panelled with comfort in mind
All other settings are internally regulated
A basic airsoft spring pistol that functions with a pull of slide back for each shot
Also have integrated backup sights on top
Only use the cylinder head this kit comes with
Polarstar JACK - HPA Standard FCU Conversion Kit Military & Government Airsoft Training Guns Aggressive 360 texturing to increaseThe 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)
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