I was doing this too and was unsure about the AFG because of this when using my friend's AFG on his carbine. When I got my own AFG and installed it on my 11.5" SBR with KAC URX II rail, I flipped the A2 nub around which provided more room so that my index finger now fits VERY comfortably in there alongside my other two fingers.
Don't know if you have tried yours with flipping the A2 nub around, but mine now works very well since I've done that.... and the stippling that I did also made it much more kick ass too!
-Paul
Bookmarks