Polarstar JACK - HPA Standard FCU Conversion Kit Spring Shotguns Sniper grade airsoft BBs for

Sniper grade airsoft BBs for its very heavy weight

Black matte hard coated anodized

Here are a few highlights

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

Tripod ready mounting hole (standard camera screw / camcorder tripods )

Polarstar JACK - HPA Standard FCU Conversion Kit Spring Shotguns Sniper grade airsoft BBs forThe 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)