Seeking information on stock markings on newly acquired Winchester M1917

[jonh172]

I too have the 3GM-K on my winchester M1917 stock.
Here is a blurb from someone much more informed than me who looked into it.

!!!Not an official decoding, take it as it is!!!

"....you show a picture of your “W” stock with a “3 GM - K” in a rectangle.**That appears to be the final inspector mark when that rifle was re-built during WWII in USA - still searching, but might be a rebuild by contractor “General Motors - Kevinator”.**Still looking…"

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[rcathey]

That appears to be the final inspector mark when that rifle was re-built during WWII in USA.

It definitely follows the general format and feel of the final inspection mark after a rebuild. So much so, I'm also quite confident that's what it is.
The theory you found is interesting. Too bad we don't yet know for certain. The likelihood of that information ever surfacing is shrinking as time goes on.