Manufacture, importation, sale, transfer, or possession of plastic firearms and unfinished frames or receivers and unserialized firearms prohibited; penalties. Creates a Class 5 felony for any person who knowingly manufactures or assembles, imports, purchases, sells, transfers, or possesses any firearm that, after removal of all parts other than a major component, as defined in the bill, is not detectable as a firearm when subjected to inspection by the types of detection devices, including X-ray machines, commonly used at airports, government buildings, schools, correctional facilities, and other locations for security screening. The bill updates language regarding the types of detection devices that are used at such locations for detecting plastic firearms. Under current law, it is unlawful to manufacture, import, sell, transfer, or possess any plastic firearm and a violation is punishable as a Class 5 felony. The bill also creates a Class 1 misdemeanor, which is punishable as a Class 4 felony for a second or subsequent offense, making it unlawful for any person to knowingly possess a firearm or any completed or unfinished frame or receiver that is not imprinted with a valid serial number or to knowingly import, purchase, sell, offer for sale, or transfer ownership of any completed or unfinished frame or receiver, unless the completed or unfinished frame or receiver (i) is deemed to be a firearm pursuant to federal law and (ii) is imprinted with a valid serial number. The bill also creates a Class 1 misdemeanor, which is punishable as a Class 4 felony for a second or subsequent offense, making it unlawful for any person to manufacture or assemble, cause to be manufactured or assembled, import, purchase, sell, offer for sale, or transfer ownership of any firearm that is not imprinted with a valid serial number. The portions of the bill prohibiting unfinished frames or receivers and unserialized firearms have a delayed effective date of January 1, 2026; however, the portions of the bill prohibiting the knowing possession of a firearm or any completed or unfinished frame or receiver that is not imprinted with a valid serial number have a delayed effective date of July 1, 2026. An Act to amend and reenact § 18.2-308.5 of the Code of Virginia and to amend the Code of Virginia by adding a section numbered 18.2-308.5:2, relating to manufacture, importation, sale, transfer, or possession of plastic firearms and unfinished frames or receivers and unserialized firearms prohibited; penalties.