If it functions like a typical m4 style airsoft gun with an adjustable hop up, then the charging handle opens the dust cover to reveal the hop up.
No.
No. Metal bb's will not work in airsoft guns.
Yes
NO
No
No
No. Paintball barrels are .68 caliber and have relatively huge threads compared to airsoft guns. Not only would they not fit, they would not work due to the large space between the barrel and the airsoft pellet.
AirsoftRC.com sells extra magazine's for this gun. Go to M06A1 airsoft gun magazine
No, they can not, do not attempt to mix real ammunition in airsoft guns.
ITS REALLY SIMPLE pull the pin
Airsoft and helicopters don't work well together because the wind from the propeller will blow the bb.
Probably a problem with the gearbox. I would send it to an airsoft store/ repair shop and have them work on it.