Definition of Armed Robbery.  In Illinois, a person commits armed robbery when he or she commits a robbery or an aggravated robbery; and

(1) he or she carries on or about his or her person or is otherwise armed with a dangerous weapon other than a firearm; or

(2) he or she carries on or about his or her person or is otherwise armed with a firearm;

(3) he or she, during the commission of the offense, personally discharges a firearm; or

(4) he or she, during the commission of the offense, personally discharges a firearm that proximately causes great bodily harm, permanent disability, permanent disfigurement, or death to another person.

Sentence.  Armed robbery in violation of subsection (1) is a Class X felony.  A violation of subsection (2) is a Class X felony for which 15 years shall be added to the term of imprisonment imposed by the court.  A violation of subsection (3) is a Class X felony for which 20 years shall be added to the term of imprisonment imposed by the court.  A violation of subsection (4) is a Class X felony for which 25 years or up to a term of natural life shall be added to the term of imprisonment imposed by the court.