SBS is specifically not legal in CA without a special permit. This is a different situation than AOW.
Uh, I now have a SBS 870. NOTHING from CA has any bearing on it. Maybe you just got the two terms swapped?
Ayearefifteen- The only issue with what you propose is that the shotgun mounted to the AR makes the AR an AW. If the AR is already reg'ed as an AW then your G2G.