The amendment outlaws "a detachable magazine, belt, drum, feed strip, or similar device that has a capacity of, or that can be readily restored or converted to accept, more than 10 rounds of ammunition; or (2) any combination of parts from which a device". The parent bill amends the Department of Juvenile Justice Mortality Review Team Act
http://amgoa.org/Proposed-Illinois-Gun-Law-HB1346/State-Law/9494
http://amgoa.org/Proposed-Illinois-Gun-Law-HB1346/State-Law/9494