California has many laws concerning firearms and regulates who can own and operate one legally. Among these: automatic weapons are illegal for all private citizens to own, and convicted felons or mental patients are prohibited from owning a legal firearm.
The penalty depends on the circumstances in the case: the type of weapon used, whether the weapon was loaded or concealed, what crime was committed with the weapon, and the individual’s prior record and drug use. A crime committed with a gun or a firearm will often lead to jail time in county or state prison. And could include expensive fines and permanent marks on your criminal record.