In Pleasanton it is illegal to shoot airsoft guns, and in all of California it is illegal to have an airsoft gun out in public (unless it is clear or neon colored) other than that I don't know
Walnut, California has a big airsoft store called Airsoft gi.
Airsoft GI, or Evike
No.
Airsoft law in California is in a confusing stage right now. It used to be legal, but California government is taking action as of recently to make them semi-illegal (meaning all Airsoft guns in Cali must be bright colors and so on). Try googling it. As for now, it is probably best to not purchase an Airsoft rifle.
Northern California.
Southern Party ended in 2003.
it depends where you are in northern California and where your destination is in southern California
The population of Southern California Edison is 15,500.
You will have to contact your local police.
I don't know of any in Baja California.
The stores are different in each state. Dick's will not sell any BB, airsoft or arrows in California and some other states. So in California, Walmart in the only option.
The hemisphere that is south of California is the Southern Hemisphere.