From Guns.com:

“The judge’s ruling completely flies in the face of what the Heller case says, “said Michel. “The Heller case said that the handguns at issue were protected because they were commonly used by law abiding citizens for self-defense. The judge in San Francisco seized on the word ‘used’ to say that magazines were holding more than ten rounds were hardly ever used for self-defense i.e. people never fired more than ten rounds, they weren’t protected.”