Looking at the two recoil blocks, it seems that it would be impossible for both to maintain contact with the rear of the notches. I'd probably use some strong bedding compound to maximize contact at those points...but that's just me.
People are like rifles. Some are tried and true, having great eyes, personality, and fun to be with. Others never seem to hit the mark with you. Still others go off half-cocked. Still, it's nice to know most of them.