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I recently bought a CMP rifle from another collector. I believe it to be a Greek return. It had not been modified or even shot since it was purchased from the CMP.
Neither of the other two 1903 rifles I own have the little plate shown in the tang pocket, nor does a spare stock I have. This bit of metal causes the tang to stand proud of the stock. The tube which goes through the wood also sticks out a little on the bottom, causing the trigger guard to protrude slightly more than usual.
I can't find reference to this bit of metal in any of the literature I have. Is this something the Greeks added? The stock is heavily sanded but is solid. The rifle ( 1934 SA receiver, Remington WW2 bolt, 1941 SA barrel) shoots OK, but it looks a little funny with the metal sticking out. I am going to put it in the spare stock to see if it shoots better, but I wondered about the purpose of this piece of metal.