Originally Posted by
tehpwnag3
IIRC, most of the problems with McFarland rings were due to improper sizing, material, and treatment. Process issues, mostly. Not all one-piece rings are the same ("parts is parts"). And because it's a wizbang part, a quality unit does cost 3x more than a perfectly good set of regular rings. So, while it could be a viable enhancement, I think distrust overran the concept. One could say that they are a solution looking for a problem, however, as linked above, Crane deemed them worthy for a fairly harsh application.
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