It could be a Remington insert, they are certainly very similar to that. Up through the 1902 Remington Arms Co. catalogue the Auxiliary Rifle Barrels are only offered in 30- and 32-inch lengths. Beginning in the 1903-04 catalogue they are also offered in 28-inch lengths. I don't find them offered at all in the 1906 and later Remington Arms Co. catalogues.
The indexing tab on the rim of the insert is in the same place as the one shown In Charles Semmer's book, Remington Double Shotguns, page 97. However, in Charles' book the insert is shown in the right barrel of a gun which had me confused for a bit!!!
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