The AFG is very good at what it does.
There is a very strong movement towards the thumb over grip, which doesn't work too well with the AFG unless you have GIANT hands. In this case a short VFG works very well as a hand stop.
I've run an AFG and a VFG as a hand stop. I've found on the shorter carbine length 7" rails the AFG works best. The rail real estate just doesn't exist to get lights, grips and hands all in the same place.
On the 10" rail of the 15/22 I find the VFG works best.
Your results may vary.
KBK