FWIW, make sure that any engraving (esp laser) goes down to the requisite depth for NFA items.
[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;