Doubs, I just read Stills again and it says "This provided for" which does not exactly sound optional. I thought it was an optional notch but what is quoted does not sound that way.
I think one hypothetical explanation of the Erfurt notch is that Erfurt was making the LP08 barrels and recievers but not assembling the pistols. They shipped the frame to DWM who installed the tangent sight and the grip frame. I have no data to support this conjecture.
regards, Heinz
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