CHICAGO (WLS) -- An Illinois state lawmaker plans to propose a bill that would require serial numbers be stamped on all ammunition sold in Illinois.State Rep. Sonya Harper, D-Chicago, believes that serial numbers would help track bullets and help police identify those who are illegally distributing ammunition."We're not trying to get rid of responsible gun owners guns, we just want to know how the guns and the bullets are getting into the hands of our youth and causing senseless harm and murder," Harper said.Harper was joined on Tuesday by several state lawmakers, Chicago aldermen and others in support of the proposal.Harper said she hopes to file the bill later this week.