From The Federalist:

Late last month, federal judge Roger T. Benitez struck down a California law in place since 2000 that banned the sale of gun magazines holding more than 10 rounds. The next day, San Diego firearms owners were jamming the phone lines of every gun store in town, desperate to lay hands on the larger, freshly legal pistol magazines before the People’s Republic of California pulled new shenanigans and made them illegal again.