Because of exemptions. [PC 20175(g)&(k)]
Penal Code 20175
Section 20170 does not apply in any of the following circumstances:
(g) The imitation firearm is used at a fair, exhibition, exposition, or other similar activity for which a permit has been obtained from a local or state government.
(k) The imitation firearm is displayed on a wall plaque or in a presentation case.
Penal Code 20175
Section 20170 does not apply in any of the following circumstances:
(g) The imitation firearm is used at a fair, exhibition, exposition, or other similar activity for which a permit has been obtained from a local or state government.
(k) The imitation firearm is displayed on a wall plaque or in a presentation case.

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