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I have a flat top RRA NM A4. I need occasional high mounts to do load work with a regular scope. Will the RRA spacer work with Burris Zee rings? How high Zee rings are needed?

Some of that depends on the scope you are using on the rifle. If it has a large bell then you'll need the taller rings. Rock River may also have rings they prefer for use with their rifles.

R,
Bullseye

I need to look at rings or spacer. The two scopes I want to use are too low.
Will probably give the spacer a try first.