Found this. But this implys actually carrying the fake firearm, if there are any legal experts on here that have any thoughts on the below.
12550. As used in this article, the following definitions apply:
(c) "Imitation firearm" means any BB device, toy gun, replica of a
firearm, or other device that is so substantially similar in
coloration and overall appearance to an existing firearm as to lead a
reasonable person to perceive that the device is a firearm.
12556. (a) No person may openly display or expose any imitation
firearm, as defined in Section 12550, in a public place.
(d) Subdivision (a) shall not apply to the following, when the
imitation firearm is:
(13) A device where the entire exterior surface of the device is
white, bright red, bright orange, bright yellow, bright green, bright
blue, bright pink, or bright purple, either singly or as the
predominant color in combination with other colors in any pattern, or
where the entire device is constructed of transparent or translucent
materials which permits unmistakable observation of the device's
complete contents. Merely having an orange tip as provided in federal
law and regulations does not satisfy this requirement. The entire
surface must be colored or transparent or translucent.
(e) For purposes of this section, the term "public place" means an
area open to the public and includes streets, sidewalks, bridges,
alleys, plazas, parks, driveways, front yards, parking lots,
automobiles, whether moving or not, and buildings open to the general
public, including those that serve food or drink, or provide
entertainment, and the doorways and entrances to buildings or
dwellings, and shall include public schools and a public or private
college or university.
(f) Nothing in this section shall be construed to preclude
prosecution for a violation of Section 171b, 171.5, or 626.10.