While its true Reagan was governer then and supported it, all he really did was sign a veto proof bipartisan bill from the California Legislature. Lets not forget those others like Don Mulford and John Knox.
On the one hand, I like the idea. On the other hand, I'm concerned about reduced capacity overall when they inevitably start limiting other locations that can be used outside of the official range.
Kinda wondering that myself.
There have been product for shotguns on the market that go into that deep screw counterbore. I'm nor sure which ones are still on the market. I don't know that any of them were any more effective than just adding weight to the gun.