CA Penal Code Section 29150

(a)

A licensee shall notify the chief of police or other head of the municipal police department in the city or city and county where the building designated in the license is located that the licensee is manufacturing firearms within that city or city and county and the location of the licensed premises.

(b)

If there is no police department in the city or city and county where the building designated in the license is located, the licensee shall notify the sheriff of the county where the building designated in the license is located that the licensee is manufacturing firearms within that county and the location of the licensed premises.