Battery powered blaster that utilize mechanical gearbox driven by a motor to propel the gel ball. Highly customizable with a plethora of accessories and upgrade parts. Typically having both semi-auto and full auto fire select, electronic units with MOSFET can have more functions and programmable firing modes. FPS can be boosted by simply swapping in a stronger main spring. For certain gearbox models it is possible to imitate the blowback action with an electronic blowback kit.
Note these types of blasters uses gel ball pellets only.