I bought a IOR handle mount for my 20" A2 but it does not seem to work. It is dead on at 50yds but then after that all groups are dinner plate size. The mount was on really tight with blue thread lock and the scope was on tight too. I see people saying that they are too high off the bore to be any good. Why is that? I guess I am thinking if good companies make them then they must work, so why don't they (or do they)? What can be done about it?