California tightens handgun restrictions

California already has some of the strictest gun control laws in the United States. But proponents fought to amend the state's so-called safe handgun requirements, arguing that it exempted for single-shot pistols which meant dealers were selling thousands of modified weapons per year without a required safety feature that indicates when a bullet is chambered.

Read more at: Reuters

There was strong grey market in selling unapproved hanguns which had been temporarily modified to single shot. The gun banners found out and closed that back door.

Sucks for any Californian wanting a Gen4 Glock. There are a couple other ways to legally do it still.