Hi, I had one (my son has it now)with a vent rib. It is a 20ga AyA Matador III. The rib is not high, but a lower type. It does not detract from the looks of the gun. In fact, it does not look bad at all.

As to an aid in shooting, I don't think they are any better or worse than anyother type of rib. Besides, you should be looking at the bird/clay, not the rib.

Anyway, just a matter of personal taste IMO.

Best of luck to you!

Greg

Gregory J. Westberg
MSG, USA
Ret