So, what are you shooting that doesn't have a rib? Few guns were ever made sans a rib of some sort.
Best,
Ted
Ted, more common on OU's than on sxs, but surely you've seen Marlin 90's and Remington 32's with no midrib between the barrels. (Krieghoffs also, copying the Model 32 design.) The Alex Martin ribless used a similar system on a sxs: Joined at the back end, joined at the muzzle (with a very short "rib" and front sight), otherwise open in between. Works quite well in both cases.
Thanks for making my point, Larry. I've actually handled a Martin ribless, but, I'll leave the model 90s for you. BTW, you forgot the most common one-The Ruger Red Label. The center ribs on that one are purely decorative, and pop right off.
I suppose I have to let a few of your senior moments slide, however. At any rate, a happy New Year to you and your's, Larry.
Best,
Ted