Just as much as if you use a real gun.
You need a lawyer
* he has a hard time having to reload it.
If its in California States
5-10 years.
It depends on where you are and what the exact charge is.
You need a lawyer for a current, legal and correct answer.
Depends on what the charge is.
You don't have to go to jsil just for having a gun. You can if you shoot someone without any good initiative such as if it's a life or death crisis. You can if you have a gun without a liscense. There are many reasons you can go to jail involving a gun, but not for just having a gun.
0 to the Death Penalty depending on circumstances
0 to Life Without Parole depending on the circumstances
in MOST of the US, there is no requirement to register a gun.