Design files or other code that can automatically program a 3-dimensional printer or similar device to produce a firearm or complete a firearm from an unfinished frame or receiver. (5) Engraving and casting serial numbers It shall be unlawful for a person other than a licensed manufacturer or importer to engrave or cast a serial number on a firearm in or affecting interstate or foreign commerce unless specifically authorized by the Attorney General. . (3) Requirements (A) Removal of serial numbers Section 922(k) of title 18, United States Code, is amended— (i) by striking importer's or manufacturer's each place the term appears