I have several times before posted photos of a 12ga CHE Bernard with Bernard ventilated rib. It is the only one I know of, but of course there could be more.
There are a number of damascus barreled guns with vent ribs. From what I have seen, the guns were originally made before vent ribs were available, then returned to Parker for addition of the rib when they began to be offered.
Doc Drew shows a rib milling machine above. The classic double with the most complex rib matting that I know of is the Lefever.
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Threaded Mode