This is a stretch, but if you took a Carcano stock and left off the upper handguard???
It definitely looks to have been at one point been a carcano stock without the handguard. The barrel retaining bands look similiarly placed, the butt on the stock looks to have the sharp angles. Compared to a longer carcano (in this case a 91/41), the notch for the safety is also similar though the franken-mosin is obviously more rounded from sanding and inletting to get the mosin action to fit.
I would agree on Carcano 'til I see something better. I'd still like to know what the tang mark is.
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