In general, yes, handguns are legal in California, but are subject to more restrictions than most other states. For instance, under most circumstances, you can only have a 10 round mag for a semiauto pistol.
For handguns? Yes. Just don't point it at any airplane.
Yes, with limitations. See related link 'California Department of Justice Approved Handguns List' for more information.
Yes.
18. ALL guns in California need to be at least 18. Handguns need the purchaser and the owner to be 21. ALL guns in CA need minimum of 18.
Nothing in my references on Dixon handguns, except the Dornaus & Dixon Bren 10, made in California by Dornaus & Dixon.
In the USofA it is legal. There are many handguns that are equipped from the factory with "features" to aid in mounting a scope.
Perhaps, but certainly not legally. Actually, it's perfectly legal in all 50 states to purchase handguns online as long as you have the handgun shipped to a local licensed dealer as a transfer, and as long as the handgun meets the requirements for the state in which you reside. I say the last part specifically because California has some laws that other states don't, such as a magazine capacity limit.
Legal age to buy a rifle or shotgun is 18. 21 for handguns.
You need to visit the BATFE website. They have the answer to your question.
California has strict gun laws and I doubt that you can legally own a 20MM rifle in California. Usually the only guns available in California are small handguns.
Recommend you contac the CA DOJ and a lawyer for the current legal answer.
No they are not legal in California