I’m from CA. All sales through licensed dealers. No face to face. Handguns, rifles and shotguns are now registered through their DROS system that they say is not registration. I sent off for all the guns. They responded with every handgun I ever bought or sold for decades. That is is registration. Long gun registration only started 1/1/2014.
I once asked the CA DOJ how long the DROS records were kept.
“For the life of the gun.”
That is De Facto registration.