Linked on Drudge:

This Daily Caller article reports on Alexander Soros $100k contribution to Cali's Prop 63 that would:

ban the possession of large-capacity ammunition magazines, regardless of when they were purchased. Current California law already bans the possession of such magazine but has an exemption for magazines purchased before the year 2000.

Prop. 63 would also require all ammo purchasers to first obtain a $50 permit from the California DoJ...

and the State would be required to keep tabs on who is or isn't allowed purchase ammo.