California law requires a technology in guns that does not exist.

From San Diego Rostra:

Last year Democratic Attorney General Kamala Harris decided that a law signed by Republican Governor Arnold Schwarzenegger in 2007 would now be put into effect. The law requires every pistol sold by a dealer in California have a serial number on the tiny tip of the firing pin so that it imprints an identifying mark on the ejected casing of a firedcartridge. Without this, a pistol cannot get onto the “not unsafe” list. It was agreed upon at the time of passage that the law would not go into effect until the imprint technology was developed.

Anti-gun laws passed in Sacramento have already ended sales by manufacturers like Barrett Firearms and STI International. Smith & Wesson and Ruger have joined fellow manufacturer Glock and organizationsSecond Amendment Foundation and National Shooting Sports Foundation in a lawsuit against California regarding their “not unsafe” gun list scheme. The attorney heading the case is Alan Gura, who in 2008 helped win Heller vs. D.C. in front of the Supreme Court, which ruled that the Second Amendment is an individual right.