This would vary from state to state. Moreover, no matter what state you are in you would need to have more information to make a determination. But generally speaking it would not be.
Actually, it's difficult to say that it "would not be," even generally. In the U.S. the general definition of deadly force is "any type of degree of force that can cause death or serious bodily injury, including loss of use of a limb or organ." Shooting someone with a BB gun can (not saying it does always, just saying it can) fall into that category. Deadly force is one of the things used to determine whether assault is just simple assault or aggravted assault.
It depends on the circumstances and the history of the suspect, but potentially, it will be the same charge as assault with a firearm, aggravated assault.
Aggravated Assault usually requires that the weapon used is a 'deadly weapon' capable of causing mortal or great injury. It would probably come down to whether the shooting was deliberate and whether they were aiming to injure the target (aiming for the face, etc).
Get a copy of the state penal code. Aggravated assault doesn't necessarily require a firearm. Additionally, aggravated assault doesn't necessarily require a weapon. If you beat someone so badly with your hands that they almost die or suffer severe injuries, that can also be ag assault.
Yes, you can be prosecuted for aggravated assault. It is the same charge as threatening someone with a larger caliber firearm.
If the person who was caught with the gun that was used in the shooting, can provide a believable trail of ownership evidence leading back to who he bought the gun from he may be able to extricate himself from the suspect list. If he can't.... good luck... you'll be considered a suspect
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Assault and battery would be the basic charges.
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if its outside of a game it can be taken as assault, same as if you attacked someone with a baseball bat
It depends on where you are as to what the specific charge is called. In my state, it's usually called aggravated assault, but that can apply to anyone, not just felons.
If it's determined not to be an accident, they could be charged with assault.