CS did make a stock for them years ago but supposedly their new fancy CNC routers can't make them any more. Believe me, more than a few folk have asked as we really want something like a 56TH stock for the 48/52. Personally I think it's more a case they can't be bothered programming them in as it's not a big enough market, I can't see how the inletting would be any more difficult than the next gun.
I'd second the 430/440 being perfect for sub 12, lovely guns to shoot.