Daryl Hallquist sent me more images of his Ethan Allen barrel and breech.
Though the contrast has faded, one can clearly identify 3 Iron "Mosaic" "Fine Laminated Steel"
I thought the breech and trapdoor were probably decarbonized/Bessemer steel
But appears very likely that they are a form of Laminated Steel also, but clearly different from the barrel, and possibly the same material as the rib
A Laminated Steel Parker clearly with a Laminated Steel breech
