Sorry, but I just don't see the purpose behind a pistol caliber carbine.
I made that determination back in like 2001 or 2002, while running an Uzi. Specifically, I was concentrating on a 200 yard shot, and thought to myself "if I had my CAR, this would be a chip shot".
Later, I got to thinking about it, and my CAR was danged close in weight to the Uzi (mine had the metal folding stock).
Thus I kept the CAR and ditched the Uzi.
If anything, I'd be wanting to go with a VERY light AR type instead.