California Code, Penal Code - PEN § 18000

(a) Any weapon described in Section 19190, 21390, 21590, 25700, 26110, or 26395, or, upon conviction of the defendant or upon a juvenile court finding that an offense that would be a misdemeanor or felony if committed by an adult was committed or attempted by the juvenile with the use of a firearm, any weapon described in Section 29300, shall be surrendered to one of the following:

(b) For purposes of this section, the Commissioner of the California Highway Patrol shall receive only weapons that were confiscated by a member of the California Highway Patrol.

(c) A finding that the defendant was guilty of the offense but was insane at the time the offense was committed is a conviction for the purposes of this section.