Buying or owning larger than ten round mags, which the recent 9th Circuit ruling was about, and buying or owning the centerfire semi auto rifles that use them, aren’t the same. The latest ruling has no effect on the laws of gun purchases, just their magazines.
Purchasing AR 15, AK -47 or any similar-in-looks or style semi auto centerfire (FAL, Thompson, CETME, HK Mp5, Uzi, etc.) has been banned for many years here for non-government purchasers.
There have been occasional work-arounds, like the “ bullet button” (Now the purchase with those are outlawed) or “hellfire” device that cracks open the action before the magazine drops. The “featureless” ARs, with kydex blades around the grip so you can’t “grip” it or a stock that removes the pistol grip altogether, are other workarounds that don’t change the functioning but take the “visual evil” away from the guns... these really affect the ergonomics and handling of the AR to the point that, IMHO, make them not worth it (Just walk in and buy a Kel-Tec or a mini 14, those are not sufficiently “evil”...yet.)
(Ca is a wacky animal, mostly rural but ruled by a few mega-large, self-righteous liberal cities installing elected clowns hell-bent on destroying this golden goose... through a brainwashed urban electorate that can’t look past a (D) next to a candidates name at voting time.)
But no, you can’t walk into Turners Outfoorsman and buy the same AR 15 style rifle that you can in free states. It may “twang”, but unless it’s a grandfathered original gun, a featureless “compliant” gun, or an illegal gun, it’s not the same. (3 of my ARs are grandfathered original condition guns, 5 are grandfathered “bullet button” guns that, until now were restricted to 10-round magazines. All are registered with the State DOJ in compliance with the laws
.)
Stay safe.