I am looking into purchasing an AR-15 type rifle. I want to get a pre-ban rifle so I can have the collapsable stock and bayo lug. At the same time, the new M4 type upper receivers are awesome, with the removeable carry handle, so I would be able to mount a dot sight on it, and put a foregrip. Now, I have looked at a rifle that is a pre-ban m4, so it has the best of both worlds. It has the bayo lug, flash hider, collapsable stock, m4 barrel, removeable carry handle. Now my question is, is that even legal in CA? I know that the m4 came out after the ban on assault rifles, so I am curious about this. Can anyone enlighten me on the whole pre-ban rules in CA?