The "4" in the barrel channel is probably a common subinspection mark. Springfield and Remington M1903 stocks were commonly stamped in that location.

The "R" in the bolt handle inletting was probably stamped by the San Antonio Arsenal when they gauged the stock during overhaul. That's my guess. I have not seen that before. The stock was clearly manufactured originally by Eddystone.

J.B.
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