Section 17280 Of Division 2. Definitions From California Penal Code >> Division 2. >> Title 1. >> Part 6.
17280
. As used in this part, "undetectable firearm" means any
weapon that meets either of the following requirements:
(a) After removal of grips, stocks, and magazines, the weapon is
not as detectable as the Security Exemplar, by a walk-through metal
detector calibrated and operated to detect the Security Exemplar.
(b) Any major component of the weapon, as defined in Section 922
of Title 18 of the United States Code, when subjected to inspection
by the types of X-ray machines commonly used at airports, does not
generate an image that accurately depicts the shape of the component.
Barium sulfate or other compounds may be used in the fabrication of
the component.