This gun was almost certainly made with 11 gauge barrels. The Parker Story discusses this in some detail. Part of the reason was the original chambering with thin wall brass shell ID. The 12 gauge standard was an 11 gauge barrel and the 10 gauge standard was a 9 gauge barrel. It even gives a date in the 1890's when there are notes in the factory books stating that future barrels would be to gauge unless stamped "O" to signify the older size. It's pretty explicit in the book, but I have found no way to verify it.
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