Extending the nose on the softnose bolt and drilling another same side ball detent were two of the less extreme methods suggested to stop roll back.
Im really itching to use my halo, its feking fast but its just too tough on the paint on my IR3.
I havent tried my halo on an A4 all I can go off is what I read on the internet. Im gonna be trying it soon though.
I sort of get how 2 ball detents could help hold the ball in place, but with the forces the halo puts ont he stack i cant see it really helping.
My LvlX mag can shoot uber brittle paint (which wont go through most guns) with the same halo, and not break one ball in several boxes so i dont think my halo is the problem.