Mle 1892 MD Berthier Help

[LTPayton88]

I have a Mle 1892 MD Berthier rifle. It is matching numbers and not import marked. The barrel is dated 1914 but I have a few questions about the rifle. I know they dated the barrels as the French reused the receiver. I have searched before to find out the rifle manufacture date and from what I recall I remember seeing it as 1914 as well but I cant seem to validate that. Does anyone know where I can validate the production date. The serial number is B 79776. Also, on the stock there is a marking that I cannot seem to identify. It is the initials R.K.M inside a box. There is a picture below. Any help identifying what I have here would be greatly appreciated. Thank you.

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