Anyone recognize this barrel stamp?

[AustinWiseguy]

I have this M1903 rifle. Serial number and Feb 1918 barrel date appear to be consistent. The rifle is in unusually clean condition for its age, the only modification looks to be the Remington bolt, but stock stamp and etching on the bolt match the last 4 of the SN, Greek return, usual markings incl floor plate. My question is the barrel stamp that's located on the underside of the barrel. It appears possibly to be the symbol "Pi" but I'm not sure.

Question: Does anyone monitoring this forum have a Greek-return with this symbol? Or anyone recognize or know what this might be? Also, there appears to be a "K" in the stock at the magazine cut-off, if anyone recognizes that as well?

Thanks in advance for any help or information.

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