m4 a1 g&p gearbox removing!
 

Hi, I got an m4 a1 with the battery inside the handguard and I want to know how can I remove the barrel from the receiver cause I want to get the gearbox out, (the cords start from the gearbox pass in the fixing ring to the handguard.)

The wiring in the handguard has disconnects to remove it from the gearbox wiring. Then you just pull it out.

There is no need to remove the barrel whatsoever.

you may have to slide the inner barrel and hop up unit back out (of the outer barrel) slightly to allow the wires in the handguard to slide out easily.