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Old 04-09-2011, 11:58 PM
Roccobro Roccobro is offline
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[Code of Federal Regulations]
[Title 27, Volume 2]
[Revised as of April 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 27CFR479.102]
[Page 188-189]
TITLE 27--ALCOHOL, TOBACCO PRODUCTS AND FIREARMS
CHAPTER II--BUREAU OF ALCOHOL, TOBACCO, FIREARMS, AND EXPLOSIVES,
DEPARTMENT OF JUSTICE
PART 479--MACHINE GUNS, DESTRUCTIVE DEVICES, AND CERTAIN OTHER FIREARMS--Table of Contents
Subpart G--Registration and Identification of Firearms
Sec. 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
[[Page 189]]
(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.
(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.


as a note, the ATF NFA Handbook is available HERE, the issue is addressed in chapter 6 and 7...marking requirements are the same for both licensees and nonlicensees who manufacture a NFA firearm.

http://www.atf.gov/firearms/nfa/nfa_handbook/

the ATF currently has this in thier regulations book under Chaper 7 "Manufacturing of NFA Firearms"

Section 7.4 The identification of firearms.

7.4.1 Serial numbers.
Each manufacturer of a firearm must legibly identify it by engraving, stamping (impressing), or otherwise conspicuously placing on the firearm’s frame or receiver an individual serial number not duplicating any serial number placed by the manufacturer on any other firearm.120

The requirement that the marking be “conspicuously” placed on the firearm means that the marking must be
wholly unobstructed from plain view.

For firearms manufactured on or after January 30, 2002, the serial number must be to a minimum depth of .003 inch and in a print size no smaller than 1/16 inch.

7.4.1.1 What is an acceptable serial number?

Alpha characters (letters), for example a name,
are not acceptable as a serial number. A proper serial number may contain such characters or
letters, but it must have at least one numeric character (number).

ATF takes the view that marking “legibly” means using exclusively Roman letters (A, B, C, and so forth) and Arabic numerals (1, 2, 3, and so forth).121

Deviations from this requirement have been found to
seriously impair ATF’s ability to trace firearms involved in crime.

7.4.2 Additional information.

Certain additional information must also be conspicuously placed on the frame, receiver, or barrel of the firearm by engraving, casting, stamping (impressing), that is, they must be placed in such a manner that they are wholly unobstructed from plain view.

For firearms manufactured on or after January 30, 2002, this information must be to a minimum depth of .003 inch.
The additional information includes:
(1) The model, if such designation has been made;
(2) The caliber or gauge;
(3) The manufacturer’s name (or recognized abbreviation); and
(4) The city and State (or recognized abbreviation) where the manufacturer maintains its place
of business.122

7.4.3 Measuring the depth of markings. The depth of all markings is measured from the flat surface
of the metal and not the peaks or ridges. The height of serial numbers is measured as the distance
between the latitudinal ends of the character impression bottoms (bases).
__________________
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