Huben GK1 - Power adjustment

Huben Pistol GK1 · Gregor Kamenšek Edition:
www.hubenairgu...
NOTE:
If you already placed a Pre-Order, please do not cancel it to order the one of the link. Wolfiek team will do the best to deliver your pre-ordered gun very soon.
How to enable power adjustment of GK1 V1 and V3:
• Unlock the Huben GK1! ...