Just like an airsoft gun, gel blasters can be upgraded. The Gel Ball Blaster Master shows how it is done with the SJ MK18 Gel Ball Blaster. This is an automatic, battery-operated device with both semi-auto and full-auto firing modes. It boasts a 1:1 ratio and a durable nylon finish on the receiver. The device is equipped with a V2 gearbox and a 2-piece nylon split receiver. It is powered by a high-performance 480 motor.