Enacts new GS 14-409B, which except for licensed firearm manufacturers under federal ATF regulations, makes it a Class I felony for any person, firm, or corporation to manufacture, sell, give away, transfer, use, or possess a ghost gun or an undetectable firearm. Defines a ghost gun as a firearm, including a frame or receiver, that lacks a unique serial number engraved or cased in metal alloy on the frame or receiver by a licensed manufacturer, maker, or importer under federal law or markings in line with federal regulations. Excludes a firearm that has been rendered permanently inoperable or a firearm that is not required to have a serial number in accordance with the federal Gun Control Act of 1968. Defines an undetectable firearm to mean a firearm that satisfies any of three listed requirements including being manufactured wholly of plastic, fiberglass, or through a 3D printing process. Applies to offenses committed on or after December 1, 2025.