You can use a one piece Burris P.E.P.R or a set of Burris Extreme Tactical,Extra High (1.00").
I use both and they are plenty high for a 50mm scope in either a 1" or 30mm main tube.
Remember that AR's do not have any drop at the comb. So to get proper eye placement you need at least 1" high rings. And 1.250" - 1.350" is even better.
None of this has anything to do with being able to align and zero your scope properly. Only thing that could effect that is if your pic rail was not milled into the upper properly and I have never heard of that happening. --- SAWMAN
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