No brainer. Since this is a Heritage gun,
gifted from Grandfather/Father/Son,
it is exempt from any list here in California.
The transfer must use a CA FFL,
the ordinary rules for an FFL transfer must be followed,
including background check and 10-day wait. The receiver should be at least 18 years old for a long gun, 21 for a handgun;
if a handgun, the receiver must also have a Handgun Safety Certificate.
The FFL should use the DROS "Curio/Relic/Exempt" process, and add a comment "27870PC intrafamily transfer".
No Firearms Shipment Approval number is required as an out of state private party is allowed to ship a gun to California, as long as it is received by a California FFL.