Probably none to be honest.
CA upper receivers are just a couple of mm higher than they should be (always have been, unless it's a very new gun and they've changed recently), and seeing as CASVs primarily attach to the upper, the rail system won't fit around the barrel nut in the way it should, and you won't be able to get the lower half of it attached.
It's a bit of a dinosaur era rail anyway to be honest, awfully heavy for what it is and bulky with it.