http://caag.state.ca.us/firearms/dwcl/12800.htm
ARTICLE 8 HANDGUN SAFETY CERTIFICATE (COMMENCING WITH SECTION 12800)
12800. It is the intent of the Legislature in enacting this article to require that persons who obtain handguns have a basic familiarity with those firearms, including, but not limited to, the safe handling and storage of those firearms. It is not the intent of the Legislature to require a handgun safety certificate for the mere possession of a firearm.
12801. (a) As used in this article, the following definitions shall apply:
(1) "Department" means the Department of Justice.
(2) "DOJ Certified Instructor" or "certified instructor" means a person designated as a handgun safety instructor by the Department of Justice pursuant to subdivision (d) of Section 12804.
(b) No person shall do either of the following:
(1) Purchase or receive any handgun, except an antique firearm, as defined in paragraph (16) of subsection (a) of Section 921 of Title 18 of the United States Code, without a valid handgun safety certificate.
(2) Sell, deliver, loan, or transfer any handgun, except an antique firearm, as defined in paragraph (16) of subsection (a) of Section 921 of Title 18 of the United States Code, to any person who does not have a valid handgun safety certificate.
(c) Any person who violates subdivision (b) is guilty of a misdemeanor.
(d) The provisions of this section are cumulative, and shall not be construed as restricting the application of any other law. However, an act or omission punishable in different ways by different provisions of this code shall not be punished under more than one provision.
I'd say they are considering renting to be a loan in this case since there is nothing in the code that says "rent" or "rental".
IANAL. Someone who is want to jump in?