The Huben GK1 pistol is a compressed air pistol that works with a pressure of 300 bar. The cylinder has a capacity of 85cc. Huben states that this is sufficient for 40 shots at a power of 7.5J. Then the pistol has to be refilled with air. You can do so using a pump, a compressed air bottle, or a compressor.
The pistol is 32.5 cm / 12.7” long, the barrel measures 21 cm / 8.2” and is in caliber 5.5mm / .22”. The pellets can be inserted into the 19-round drum magazine from the right. To rotate the magazine for loading, a lever on the left side of the action has to be tilted downwards. Then you can continue to rotate the magazine clockwise after loading a pellet.
Huben GK1 has a manual safety. It is next to the pressure gauge on the left-hand side. Once you have disabled the safety, you can fire 19 shots in less than 3 seconds.