Manufacture, import, sale, transfer, or possession of undetectable firearms; penalty.

Creates a Class 5 felony for any person who manufactures, imports, sells, transfers, or possesses any firearm that, after removal of all parts other than a major component, defined in the bill, is not detectable as a firearm by the types of detection devices, including X-ray machines, commonly used at airports for security screening. The bill also updates language regarding the types of detection devices that are used at airports for detecting plastic firearms.