I shoot a variety of ribs styles, concaved, raised, raised tapered, and sunken on a couple French shotguns and I never think about them and they all shoot.well. I did see a sxs with a short rib near the breach and just enough at the muzzle to mount a bead and connect the barrels, I would have liked to shoot it. I will say the tapered rib makes the barrels seem longer than their 25" length when looking down them.