The narrowest front end of a tapered rib I have seen is less than .250. It is a 32" 12 gauge barrel. I have the build card for that gun, with special features that cover both sides of the card, but no sign of a request for a tapered rib. Pictures of the build card and the gun is on page 51 of the Double Gun Journal, Volume 8, Issue 1. By the way, a high flat solid rib gun is pictured in The Parker Story, probably in the Grades section under C Grades. I lived with that wonderful gun in the showcase at The Gentleman Hunter store for months and didn't bite the bullet.

I'm glad Doc Truitt is posting pics of that rib. Great gun, one of my favorites.

I did get a letter on my CH and there was not any mention of the rib either.

Since there is no mention of the type of rib in the order books (other than ventilated ribs)
I wonder if the different types of ribs were used to adjust the weight of the barrels or balance point of the gun? Tapered ribs would seemingly be lighter towards the end than standard or wider ribs.

Guys forgive me but I cant seem to get my pictures on here.
Can I email them to someone more computer savy?
7 pics total of the rib.

The rib measures 34" length, 7/32" wide at the tip (top of the rib), 15/32" wide at the breach (top of the rib), and is 5/16" high/ above the barrels.
Letter states ordered with "special flat rib" charge was $5 for the rib.

The next weirdest rib I have is on the 34" 16 ga VH.
This rib is 34" in length, 7/32" wide at the tip (top again), 15/32" wide at the breach (top again), and swamps like a big dog or more like a saddle back horse.

John, a 34" 16-gauge VH?? Wow!

There is mention of ribs besides vent ribs. My 8 ga was ordered with a flat rib, straight stock, pad and 34" barrels. All was noted in the stock book andor order book

Here are some of the photos from Doc Truitt: