Napa does not have an ordinance against carrying firearms. The only reference that I could find in the municipal code was in reference to discharging a firearm:
9.20.010 Discharging firearms.
A. Every person who, except in a regularly licensed shooting gallery, shall discharge any pistol, firearm, air gun, musket, slingshot or instrument of any kind, character or description, which throws a bullet, shot or missile for any distance, by means of the elastic force of gases or any explosive substance, is guilty of a misdemeanor.
B. The provisions of subsection A shall not apply to the discharging of shotguns in a hunting area for which a permit has been issued by the police chief. Said hunting areas shall not be smaller than one hundred acres nor lie within one hundred yards of any public road or residence and shall be subject to such further reasonable restrictions as may be set forth in the permit. Neither shall they apply to police officers acting in the line of duty.
(Rev. Code 1954, Â§ 6162; Ord. 1308, 1958; Ord. 1619, 1964)