27 CFR 479.102 How Must Firearms Be Identified

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Bureau of Alcohol, Tobacco, Firearms, and Explosives, Justice
§ 479.102 How must firearms be identified?
(a) You, as a manufacturer, importer,
or maker of a firearm, must legibly
identify the firearm as follows:
(1) 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, imported, or made 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
(2) 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, imported, or
made 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:
(i) The model, if such designation has
been made;
(ii) The caliber or gauge;
(iii) Your name (or recognized abbreviation) and also, when applicable, the
name of the foreign manufacturer or
maker;
(iv) In the case of a domestically
made firearm, the city and State (or
recognized abbreviation thereof) where
you as the manufacturer maintain
your place of business, or where you, as
the maker, made the firearm; and
(v) 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 you as the importer
maintain your place of business. For
additional requirements relating to imported firearms, see Customs regulations at 19 CFR part 134.

§ 479.103

(b) The depth of all markings required by this section will be measured
from the flat surface of the metal and
not the peaks or ridges. The height of
serial numbers required by paragraph
(a)(1) of this section will be measured
as the distance between the latitudinal
ends of the character impression bottoms (bases).
(c) The Director may authorize other
means of identification upon receipt of
a letter application from you, submitted in duplicate, showing that such
other identification is reasonable and
will not hinder the effective administration of this part.
(d) In the case of a destructive device, the Director may authorize other
means of identifying that weapon upon
receipt of a letter application from
you, submitted in duplicate, showing
that engraving, casting, or stamping
(impressing) such a weapon would be
dangerous or impracticable.
(e) A firearm frame or receiver that
is not a component part of a complete
weapon at the time it is sold, shipped,
or otherwise disposed of by you must
be identified as required by this section.
(f)(1) Any part defined as a machine
gun, muffler, or silencer for the purposes of this part that is not a component part of a complete firearm at the
time it is sold, shipped, or otherwise
disposed of by you must be identified
as required by this section.
(2) The Director may authorize other
means of identification of parts defined
as machine guns other than frames or
receivers and parts defined as mufflers
or silencers upon receipt of a letter application from you, submitted in duplicate, showing that such other identification is reasonable and will not
hinder the effective administration of
this part.
(Approved by the Office of Management and
Budget under control number 1140–0050)
[T.D. ATF–461, 66 FR 40601, Aug. 3, 2001, as
amended by ATF–11F, 73 FR 57242, Oct. 2,
2008]

§ 479.103 Registration of firearms manufactured.
Each manufacturer qualified under
this part shall file with the Director an
accurate notice on Form 2 (Firearms),
Notice of Firearms Manufactured or

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