SECTION 1. Section 16700 of the Penal Code is amended to read:
16700. (a) As used in this part, "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.
(b) As used in Section 20165, "imitation firearm" does not include
any of the following:
(1) A nonfiring collector's replica that is historically
significant, and is offered for sale in conjunction with a wall
plaque or presentation case.
(2) A spot marker gun which expels a projectile that is greater
than 10 mm caliber.
(2)
(3) 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, as provided by federal regulations governing
imitation firearms, or where the entire device is constructed of
transparent or translucent materials which permits unmistakable
observation of the device's complete contents, as provided by federal
regulations governing imitation firearms.
EDIT:
current version of section 16700
(a) As used in this part, "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.
(b) As used in Section 20165, "imitation firearm" does not include
any of the following:
(1) A nonfiring collector's replica that is historically
significant, and is offered for sale in conjunction with a wall
plaque or presentation case.
(2) A BB device.
(3) 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, as
provided by federal regulations governing imitation firearms, or
where the entire device is constructed of transparent or translucent
materials which permits unmistakable observation of the device's
complete contents, as provided by federal regulations governing
imitation firearms.

penal code section 20170
(a) No person may openly display or expose any imitation
firearm in a public place.
(b) As used in this section, "public place" means an area open to
the public and includes any of the following:
(1) A street.
(2) A sidewalk.
(3) A bridge.
(4) An alley.
(5) A plaza.
(6) A park.
(7) A driveway.
(8) A front yard.
(9) A parking lot.
(10) An automobile, whether moving or not.
(11) A building open to the general public, including one that
serves food or drink, or provides entertainment.
(12) A doorway or entrance to a building or dwelling.
(13) A public school.
(14) A public or private college or university.
stinking 8......
