Bob I have seen the narrow tapered rib on all gauges 12 through 410 and in barrels 28 and more. That's just what I've seen and I sure haven't seen them all. There is no mention of it in TPS nor has it been found in Parker documents but it surely exists
Sounds like you have a wonderful 20ga
Here is the narrow tapered rib on a 1905 CHE 16 ga 28 that I will take with me for the next month. A favorite hunting gun.
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