Redbone, I may be wrong as I haven't reviewed the specific laws since I moved into the state a few years ago. But my understanding was/is that once you registered an "assault rifle" in CA before the deadline they imposed (don't remember the exact date/year anymore) you couldn't take it out of the state...they wanted you to sell the lower/rifle to an FFL dealer in CA or sell it back to the DOJ. I could be totally mistaken, I'll have to go back tonight or tomorrow and review their laws regarding assault weapons that have been registered in that state. For some reason I want to say there was a clause that stated if you registered your assault weapon in CA that it had to stay in that state, either with the original registered owner, or sold to an FFL dealer or the DOJ. My memory could be way off, so I'll have to review the law...
edited for late night spelling errors