Before you buy the rings buy the scope and caps. Then measure the clearance from the scope that means the 50mm plus whatever thickness in the tube plus the scope cap.
If you don't have the scope then give it at least 1/4 extra inch. otherwise 1/8 or so would be perfect for clearance.
Since the rail is aluminum I would go with sturdy aluminum rings for now. I would start with two but perhaps use three if the scope is heavy and large.
Bed the rail even if it is aluminum.
When you are done then plumb the entire system to adjust the scope and find the perfect alignment between bore and vertical axis in the erector tube.
I know you know the level system doesn't work.
If you don't have the scope then give it at least 1/4 extra inch. otherwise 1/8 or so would be perfect for clearance.
Since the rail is aluminum I would go with sturdy aluminum rings for now. I would start with two but perhaps use three if the scope is heavy and large.
Bed the rail even if it is aluminum.
When you are done then plumb the entire system to adjust the scope and find the perfect alignment between bore and vertical axis in the erector tube.
I know you know the level system doesn't work.
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