(a) A person commits possession of a stolen firearm when he or she, not being entitled to the possession of a firearm, possesses the firearm, knowing it to have been stolen or converted. The trier of fact may infer that a person who possesses a firearm with knowledge that its serial number has been removed or altered has knowledge that the firearm is stolen or converted.
     (b) Possession of a stolen firearm is a Class 2 felony.