Air Gun Sale to California

It appears that airguns in California are restricted for purchase to persons 18 years of age or older. Do interstate sales have to go through an FFL or can air guns be mailed/ shipped person to person, as long as the buyer in California is confirmed to be of age?

I think you can ship directly to the person, no FFL required.  From this link:  https://airgunlaws.com/california-airgun-laws/

This prohibition does not prevent the manufacture, purchase, sale, shipping, transport, distribution, or receipt, by mail or in any other manner, of imitation firearms:

• Solely for export in interstate or foreign commerce;
  
• Solely for lawful use in theatrical productions, including motion picture, television, and stage productions;
  
• For use in a certified or regulated sporting event or competition;
  
• For use in military or civil defense activities, or ceremonial activities; or
  
• For public displays authorized by public or private schools.
  

Imitation forearm = BB gun, air pistol, air rifle less than 6mm. (my comment)