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Maybe this is related to a "shooting at night difference". In the early 1900s Emil Flues secured a patent for a removable ventilated rib for his trap guns. The rib had a button at the muzzle , when compress, would allow the rib, sans posts, to be pulled forward and off of the gun. There was conjecture among a couple of fellows I talked to that night shooting was improved by using a rib height different than a rib used in the daytime. I'm open to any other thoughts.