California requires a very expensive drop test of pistols to be sure they don't discharge if dropped.
They also have to have a loaded chamber indicator.
Single action revolvers are exempt.
Since I have purchased several pistols since the tests were started without the magazine disconnect, I don't think that feature is a requirement.
There are plenty of pistols on the approved list at the DOJ website.

Every big manufacturer of 1911 pistols has pistols for sale in Ca.

Bruce