Website: https://deltagroupairsoft.com Description: Electrically powered airsoft guns use a spring-loaded piston pump just like spring guns, but instead of manual operation they typically use portable rechargeable battery packs to power an internal electric motor, which transmit through a gearbox to compress the pump spring and propel/load the pellets in a cyclic fashion. Selective fire options among automatic, 3-round burst and semi-automatic operations are all possible . read full review »