I guess in lawyers terms, a Form 1 "Application to Make and Register a Firearm" would imply that you are a manufacturer (would need clarification on the term "licensed" below however). The following was taken from this,
http://www.guntrustlawyer.com/5300-4.pdf;
§ 478.92 How must licensed manufacturers
and licensed importers identify
firearms, armor piercing ammunition,
and large capacity ammunition feeding
devices?
(a) (1) Firearms. You, as a licensed
manufacturer or licensed importer of firearms,
must legibly identify each firearm
manufactured or imported as follows:
(i) 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;