The Perazzi that prompted this discussion is certainly nice. However, OU's will benefit from a ventilated rib if they are intended for high-volume shooting. The ventilated rib will dissipate the heat and associated heatwave visual distortions that appear above the barrel when the barrels get hot. I have an OU with a solid top rib that will develop heatwave distortions during a quick round of skeet. No issues with similar guns using ventilated ribs. So, yes, at least ventilated ribs serve a purpose. Brister and others have also written about the benefit of top ribs.
| 