Finally found the law. Since it is a search link I am not sure how long it will be valid.
http://www.leginfo.ca.gov/cgi-bin/wa...ction=retrieve
The new section from 2007 is below:
Quote:
(7) Commencing January 1, 2010, for all semiautomatic pistols that
are not already listed on the roster pursuant to Section 12131, it
is not designed and equipped with a microscopic array of characters
that identify the make, model, and serial number of the pistol,
etched or otherwise imprinted in two or more places on the interior
surface or internal working parts of the pistol, and that are
transferred by imprinting on each cartridge case when the firearm is
fired, provided that the Department of Justice certifies that the
technology used to create the imprint is available to more than one
manufacturer unencumbered by any patent restrictions. The Attorney
General may also approve a method of equal or greater reliability and
effectiveness in identifying the specific serial number of a firearm
from spent cartridge casings discharged by that firearm than that
which is set forth in this paragraph, to be thereafter required as
otherwise set forth by this paragraph where the Attorney General
certifies that this new method is also unencumbered by any patent
restrictions. Approval by the Attorney General shall include notice
of that fact via regulations adopted by the Attorney General for
purposes of implementing that method for purposes of this paragraph.
The microscopic array of characters required by this section shall
not be considered the name of the maker, model, manufacturer's
number, or other mark of identification, including any distinguishing
number or mark assigned by the Department of Justice, within the
meaning of Sections 12090 and 12094.
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So it looks like only new pistols (perhaps from Jan 1, 2010 and not yesterday) being added to the list need the marking ability and it is specifically not considered a gun serial number, so defacement laws should not apply. I would hope that no gun manufacture ever sells a gun in CA meeting these requirements.