Gents I recently picked up a M 1861 made by the Trenton loco works in 1863. I have a couple of questions and I hope someone there will have an answer. After dissasembling my rifle I discovered several markings on the breech end of the barrel, surrounding the tang plug.

in no particular order they are as follows. Z 3s08 2 with a line over it.

Incidentally is the tang plug/screw supposed to come out of the barrel easily?Attachment 20078Attachment 20077
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