Guns that went through rebuild probably did get marked with the rebuild facility's mark and a proof P mark. It is doubtful that any of the rebuilt guns had their receivers marked with a "US" or flaming bomb. But not all shotguns went through rebuild. Some probably remained at various bases, with National Guard units, and the like; and some were sold off shortly after WW1 including new unissued trench guns that were never martially marked by the Govt'.
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