Thanks for the replies. I was referring to the wall thickness at the chambers/breach. In the picture below you can see there is just enough room for 2 12 gauge shells and not much "barrel material" around them.
At some point the pin was welded/converted so it no longer extends when the the gun is open(I think that was a common practice).
I like it more and more as I look it over. It will be interesting to see what the letter says.
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