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
Less than 100 to 500 or so
I hate to answer a question with a question but, can you be more specific?
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.