[doorgunner69]

So what happens to preexisting old large mags?

Same thing as after the first "assualt weapon" registration laws decades ago: most are stashed away.

Some day I will try and find out just what % of owners actually did "register" back then. I sent mine out of state for safe keeping.

I do remember hearing a police call on the scanner some time after that period, and the dispatcher telling the responding cops that there was an assault weapon registered to that address. The cops were using the registration info, regardless of the bleating of politicians.

[Redcitizen]

Since you sent them out of state, has there been any inquiries from the state authorities about the status of them?

[Polynikes]

“I do remember hearing a police call on the scanner some time after that period, and the dispatcher telling the responding cops that there was an assault weapon registered to that address.”

California DOJ ties gun registration to your California D/L. They can cross reference any contact you have with LE using your DL # to pull up what you have registered to you at least with pistols. I have heard it being done when a gun was found at a traffic stop although there seemed to be an issue over specific SN’s on a pistol at least as far as the inquiry went.