Why not just use a pistol for home defense?
AK47 with soft-points or hollow points will make good home defense if you have a ranch to defend.
Are Yugo M70 AK47 variants legal in California? They make good Close-quarter combat/defense rifles because they have collapsible stock... and as long as you don't use FMJ rounds.
I watched the movie "Munich", and the terrorists used them indoors, and as long as the movie was protraying, the FMJ rounds didn't seem to penetrate the walls... but again, that is hollywood for you. I would stick to hollow or soft points.