Knowing how the military sometimes works, it is concieveable that at some pont in time some fool got hold of some .30 Luger ammo and caused an issue of some sort.
They might have confused the length and stock with a carbine or a Borchardt.
A possible reponse is that somebody high up in the chain decided a good idea would be to mark pieces issued with a stock a red nine.
They are pretty rare. Just thinking late at night of some practices I have encountered.
I suppose we could have a contest and best guess wins something.
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