Avis barrels were made during WWI and used as replacement barrels, but the ones I have seen had the letters "A V" instead of "S A" where the maker's initials appear. Some barrels had "A V" further down, with the "S A" in the normal place; those are supposed to be Avis barrels finished by Springfield and marked by them. I have not seen any barrels with just "A"; it might be a variation of "A V", but I don't know.
Jim
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