In the 1990's, when I saw the righting on the wall for California, I made some purchases.
Picked up a lot Browning HP magazines, a bunch of magazines for my Mini-14, and bought about 20+ magazines for a rifle I didn't own yet, an FAL.
Waited and wasted too much time. Finally got one.
It's PRK neutered, so all the 20 round magazines I own can't be used except when I'm out of state, but...
DSA G1 receiver and STG58 kit (very minty) built by AZEX in Phoenix.
I don't like the STG stock or guards so I replaced them with an Israeli stock and a Penguin handguard. Also don't like California legal muzzle brakes (but I can't leave it with the STOLL or a naked threaded barrel) so I put on a fake T48 flash hider. 10 round magazine is fixed in place with a set screw through the release.
Shoots like a dream. I'm an idiot for not getting one earlier.