AEG is Automatic Electric Guns powered mainly by Rechargeable Battery. AEG airsoft gun is usually equipped with Electric Motor and Gearbox. Newer guns, especially those made in Taiwan and China, have metal internal and external parts. Japan has specific rules about producing airsoft guns with metal parts. A typical airsoft gun is noticeably lighter than its "real steel" counterpart due to the use of aluminum, alloy, and plastic, though some have weights in them for a more realistic feel.