It appears to mean that rifles (or receivers) that are not listed explicitly in Penal Code Section 12276 or the Department of Justice's Assault Weapons Identification Guide (see [url]http://caag.state.ca.us/firearms/awguide/index.html[/url]), and lack the features that define a California assault weapon (see PC 12276.1), can be legally manufactured, imported into, or transferred within the state.
That is, IF you can find an FFL who is willing to get one for you, and your FFL can find someone who is willing to manufacture one or to ship it to California, you can buy one. If it happens to be an AR-15 type rifle, you can't build it into a COMPLETE rifle (i.e. with a pistol grip or thumbhole stock) until it gets explicitly listed as an assault weapon in either PC Section 12276 or the Assault Weapons Identification Guide.
This could get very interesting. Manufacturers could play "chamelion" and change their name and model designation. The only way for the AG to completely stop people from obtaining new ARs would be for him to STOP adding new makes and models to the list.
Hmmmmmmmmmm. [rolleyes]