Try oiling of the gearbox.
in general 180 $ is the minimum for a reliable rifle.
No. No license is required.
Contact the maker to see if it is possible and what it will cost.
Mechanical malfunction of some sort
300 fps or 320
I hate to answer a question with a question but, can you be more specific?
Less than 100 to 500 or so
A rail interface system or a mount on the top
Most guns come in black.
buy one
375 FPS
Usually not. But you must cock it between each shot.