I would be much more concerned about the frames the conversion cylinders were fitted to, than the cylinders themselves.
The Ruger Old Army (ROA) uses the same frame as their centerfire revolvers - not so with many replica types, and doubly so with brass-framed guns.
A revolver with a top strap is inherently stronger than any open top, but the steel used in many replicas isn't as strong as the steel used for centerfire revolvers.
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