The CM030 AEP from CYMA gets updated with a MOSFET and thus called the CM030S and you can find one at Tanie Militaria... "The replica of the CM030S electric pistol is mainly made of high-quality plastic. Metal is used to make small internal elements and a magazine.

The replica is powered by a built-in 680 mAh LiPo battery, thanks to which we can use it during winter games without any problems. The big advantage of this gun is the Hop-Up system, which allows to increase the performance of the replica. The muzzle velocity allows it to be used in buildings and at very short distances.

This series of CYMA pistols is equipped with a built - in  MOSFET chip  that improves the performance of the replica, such as the trigger response or rate of fire. The engine also saves the built-in  LiPo 680mAh battery .

Access to the built-in battery is obtained after removing the replica slide after pressing the dummy hammer."