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The Action Army Hopup Chamber is a must-have for VSR sniper rifle users
The HK VP9 Spring Pistol
This is the newest 2019 version that is a moderately larger size for adults
Estimated 10-15% efficiency improvement
Polarstar JACK - HPA Standard FCU Conversion Kit Version:V3 (AK G3) The Action Army Hopup ChamberThe 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)
US$ 34.50
US$ 35.00
US$ 109.00
