Do firearms caliber have to be stamped on gun?

Answer 1

Yes every gun must have the caliber or gauge stamped on the barrel. The ATF wording is as follows.

Pursuant to 27 CFR § 478.92(a)(1), you, as a licensed manufacturer or licensed importer of firearms, must legibly identify each firearm manufactured or imported as follows:

• By engraving, casting, stamping (impressing), or otherwise conspicuously placing or causing to be engraved, cast stamped (impressed) or placed on the frame or receiver thereof an individual serial number. The serial number must be placed in a manner not susceptible of being readily obliterated, altered, or removed, and must not duplicate any serial number placed by you on any other firearm. For firearms manufactured or imported on and after January 30, 2002, the engraving, casting, or stamping (impressing) of the serial number must be to a minimum depth of .003 inch and in a print size no smaller than 1/16 inch; and
• By engraving, casting, stamping (impressing), or otherwise conspicuously placing or causing to be engraved, cast, stamped (impressed) or placed on the frame, receiver or barrel thereof certain additional information. This information must be placed in a manner not susceptible of being readily obliterated, altered, or removed. For firearms manufactured or imported on and after January 30, 2002, the engraving, casting, or stamping (impressing) of this information must be to a minimum depth of .003 inch. The additional information includes:
• • The model, if such designation has been made;
  • The caliber or gauge;
  • Manufacturer's name (or importer's name when applicable) (or recognized abbreviation) and also, when applicable, the name of the foreign manufacturer;
  • In the case of a domestically made firearm, the city and State (or recognized abbreviation thereof) where the manufacturer maintains their place of business; and
  • In the case of an imported firearm, the name of the country in which it was manufactured and the city and State (or recognized abbreviation thereof) where the importer maintains their place of business.
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• Exception to above- arms such as miltary arms that have been imported in the past may not be marked with the caliber.