The Mosin has an unusual extra stock reinforcement in the wrist area. No doubt done during one of the Soviet refurb programs. What year and factory are shown on the barrel shank?

That Mauser stock is odd. There's no bolt disassembly washer but it does have a WWII German style sling slot. Maybe that's a Mitchell's Mausers thing, unless the came off another Mauser like a WWI 98AZ.

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Release the Kraken