A look at the HPA-powered Ares Airsoft Amoeba Honey Badger by Mister Moro in this Hyperdouraku review... "The Honey Badger is ARES' first model equipped with an HPA unit.

HPA stands for High Pressure Air, and refers to a gas gun powered by gas or compressed air. In the case of the ARES, the valve opening is electronically controlled with a solenoid valve, allowing for switching between semi-auto and full-auto modes. Despite being a gas gun, it offers extremely stable operation and high response. Furthermore, since gas is used solely for firing, without blowback, it offers the quiet operation, low vibration, and low fuel consumption of a fixed-slide gas gun."

Read more here and below is the video review: