So you’ve got a kit and want to install it on your rifle, check out the instructions linked below:
Battery installation for AEG Models
Start by removing the fastening bolt holding the handguard onto the receiver.
Then slide the handguard forward past the gas block.
Connect the battery and slot it into the space between the receiver mount and the gas block.
Slide the handguard back over the gas block and battery.
Slide the handguard all the way over the receiver block until it is butted up against the receiver and the fastening bolt reinstalled.
And that’s it your rifle assembled and ready to take to the field!