Just as a side note a sunken or ribless gun does not necessarily have to be muzzle light. the barrels themselves can be built heavier, longer or both & even a muzzle heavy ribless gun would be no problem to achieve. I have not handles a Marlin 90 in some time, but as I recall I would not call one of those particularly muzzle light.
The term "FEW" is most often used in a relative manner. When one compares the number of makes/models of sunken rib SxS, Ribless SxS or ribless O/U to those bearing full ribs then in my opinion they are rare indeed. All the models of ribless designs which have been named here I could count on my fingers. How many hands you reckon it would take to get enough fingers to count those having full ribs??? Its quite unusual for me, but this time I have to agree with Ted.
