If you have the money, someone will do it.
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Do a search on the web for "airgun repair" and locate someone near you that repairs airguns.
Take it to an authorized repair center.
Needs to be repaired.
BB = Ball Bearing. It a form of Shot, used by shotguns.
Head shot.
It is not likely, but it IS possible. Depends on the bb gun, distance, and where you are hit.
BB gun
Not normally
no
The compressed air gun, which shot metal bb's was invented before the paint marking gun.
Yes it could cause problems.
It can be either a BB gun or pellet gun. The slide, on top, blows back and reloads the next shot when you fire the pistol.
If it is inside and the BB doesn't leave the building. It is against the law to shoot your BB gun outdoors.