If there was really any advantage wouldn't Parker Bros. have used it as standard? I've seen a few others. The one I recall most was on a very late CHE 12-gauge 3-inch magnum at Randy Shumans many years ago.
When Remington Arms Co. introduced their hammerless doubles in October 1894, the flat rib was "standard" and a "hollow" rib was optional on the higher grades. Slowly but surely the "hollow" rib became more and more standard to where by about 1905/6 even the K-grades had it.
Actually, if the gun fits and one is shooting correctly, the rib shouldn't make any difference at all. You should be focused on the target, not the rib. Makes me laugh to myself every time I'm on a skeet squad with guys with all those big day-glow gizmos on their ribs!!
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