Why not, if you are prone a lot, go ahead. If you run a lot, I wouldn't suggest it, they can get hot.
There should have been a battery and charger that came with it. (electric) I think you can buy a 7.2v battery and a charger at airsplat
A good brand of electric razor that leaves minimal cuts would be RazorSharp. I have used it for years and I believe it does a good job of getting your facial hair soft and smoothly.
in general 180 $ is the minimum for a reliable rifle.
soft clean cloth
Try oiling of the gearbox.
It has to be electric (AEG).
Most good air soft airguns have a metal spring, gears and gearbox. The rest of the gun is plastic with an electric motor.
No. No license is required.
look around on Amazon.com
Contact the maker to see if it is possible and what it will cost.
Mechanical malfunction of some sort
300 fps or 320