Polarstar JACK - HPA Standard FCU Conversion Kit Spring Shotguns Does not work with the

Does not work with the L96 AWS or Type 96 guns

Uses UMP magazines - hicap or midcap

2021 update:  Will fit the Valken 11

Quick Focus Eyepiece

A single shot 40mm airsoft grenade launcher with folding stock and front grip

Polarstar JACK - HPA Standard FCU Conversion Kit Spring Shotguns Does not work with theThe 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)