Amends the Undetectable Firearms Act of 1988 to: (1) extend the Act for 10 years; and (2) expand such Act to prohibit the manufacture, import, sale, shipment, delivery, possession, transfer, or receipt of any receiver or barrel that is a major component of a firearm and that, when subjected to inspection by the types of x-ray machines commonly used at airports, does not generate an image that accurately depicts the shape of the component. Includes such a receiver or barrel within specified exceptions to such prohibition otherwise applicable to undetectable firearms.