When referring to an airsoft gun, "AEG" stands for automatic electric gun. AEGs are airsoft rifles that can be semi-automatic or fully automatic. "AEP" stands for automatic electric pistol.
AEGs have an internal electric motor powered by a rechargeable battery. The electric motor cocks the weapon, so an AEG does not need to be manually cocked in between shots. These guns are the most powerful airsoft rifles available as of 2014 and are a popular choice among airsoft enthusiasts. An AEG can fire between 100 and 6,000 rounds per minute. In addition to their power and automatic capabilities, many AEGs are replicas of real-life rifles.