My son who is active Army decided he wants me to scope his M1A loaded. He has the archangel stock on it currently and it has the built in cheek riser. He wants me to order him a Bassett pic rail high mount (so he can still use peep sights). He has a Sig Sauer Sierra, 3bdx, 2.5-8x32 scope with a 30mm tube that he wishes to use. Now I need to know which height rings to use with this set up. He was looking at the Burris rings for it, not that it really matters. Open to any and all suggestions. Thanks in advance.