Did you get a stripped lower or complete lower?
Not sure what CA law is, but you should be able to have most of the parts shipped directly to your door.
Here is a good summary of compatible parts.
https://www.gunbuilders.com/blog/the-ar10-vs-the-lr308-parts-guide/
Stripped. Thanks for the link! I’m not sure if I can get parts shipped here. We have to pass a background check just to purchase ammo.