Citation(s) from the GunPolicy.org literature library
USA. 2012 ‘Marking of All SALW at Time of Manufacture.’ National Report of the United States of America on its Implementation of the United Nations Programme of Action to Prevent, Combat and Eradicate the Illicit Trade in Small Arms and Light Weapons in All Its Aspects (UNPoA), p. 4. New York, NY: Permanent Mission of the United States to the United Nations. 3 August
Section II, para 7, 8 Section III, para 12: Marking of All SALW at Time of Manufacture
U.S. Laws and Policies Supportive of the UN POA
All licensed importers and manufacturers are required to mark each firearm manufactured or imported into the U.S. with the serial number, make, model, and caliber or gauge of the firearm, as well as the name, city, and state or foreign country of the manufacturer and if imported, the city and state of the importer. Confiscated firearms retained for official use are marked if not already marked.
Since the 2001 UN Conference on SALW, ATF has established specific height (1/16th inch) and depth (0.003 inch) marking requirements for licensees who import or manufacture firearms…
[SALW = Small Arms and Light Weapons; ATF = Department of Justice, Bureau of Alcohol, Tobacco, Firearms and Explosives]