Synopsis As Introduced Creates the Unserialized Firearm Serialization Act. Provides that the Illinois State Police shall maintain a database of each firearm possessed in the State that does not have a serial number imprinted on the firearm by a federal firearms importer or a federal firearms manufacturer. Provides that within 180 days after the effective date of the Act, the owner of a firearm that does not have a serial number imprinted on the firearm by a federal firearms importer or a federal firearms manufacturer shall submit an application to register the firearm with the Illinois State Police. Provides that upon the filing of the application, the Illinois State Police shall assign a unique serial number and conditionally register the firearm pending confirmation that the serial number has been imprinted on the firearm. Amends the Criminal Code of 2012 to provide criminal penalties for a person to knowingly sell, offer to sell, or transfer a firearm that is not imprinted with a serial number issued under the Unserialized Firearm Serialization Act or by a federal firearms importer or federal firearms manufacturer in compliance with all federal laws and regulations regulating the manufacture and import of firearms, unless the person selling and the person receiving or purchasing the firearm is a law enforcement agency, federal firearms importer, or federal firearms manufacturer. Provides other exceptions. Amends the Freedom of Information Act to make conforming changes. Contains a severability provision.