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While I am not in the C11 size, I have this unfounded fear of the rail(s) being attached via small lightweight screws, into the alloy rear and front cells. I know this is paranoia, but to me the rings are the way to go.
The RCOS are a different sort of tube assembly, and to compare them is not really relevant I reckon. Plus, why have the top rail, do what I do, mount the finder/guider onto the underside of the saddle, it is essentially a fixture, regardless of the scope in use, it remains with the mount.
Gary
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