We have posted news about the Brushless Motor made by Taiwanese company Novatech before. Now we see it available in Japan under the name of Option No.1 Electric Brushless Motor System (EBMS). This does not have a brush and commutator of a conventional electric motor and brushless motors are widely in use in remote controlled planes.
Hyperdouraku writes an article how they installed the EBMS into the Tokyo Marui M933 Commando AEG. Turn on your online translation tools to follow the procedure if you want to use the same motor for your AEG.