Featureless in CA is good to go in my book. A pistol grip has to allow for a PG style grab with the web of the hand BELOW the action. The AFG does not allow this, even if your hands were HUGE, grasping it ala VFG style would still have the web of your hand above the action.
Of course this is all relating to CA law, which Magpul will most likely not give anyone a firm answer as DOJ would never give them a firm answer.
The only firm answer we might get is from ATF in regards to this being used on a Pistol, in which case it can than be argued that if ATF does not considered a VFg than it is also not a VFG in CA. So right now I'd say it's g2g on CA featureless but not on Pistols.