Contra Costa Ammunition Law

[Librarian]

Wouldn't ammunition also fall under State preemption?

No, because that bit of Government Code doesn't mention 'ammunition'

53071. It is the intention of the Legislature to occupy the whole
field of regulation of the registration or licensing of commercially
manufactured firearms as encompassed by the provisions of the Penal
Code, and such provisions shall be exclusive of all local
regulations, relating to registration or licensing of commercially
manufactured firearms, by any political subdivision as defined in
Section 1721 of the Labor Code.