Army Ordnance Extractor Nose
While everyone may have their own ideas about the shape of a 1911 extractor nose, probably the best frame of reference (or starting point) is the Army Ordnance blueprint. Unfortunately, all of the Ordnance blueprints I've seen are too small to get a good feeling for what it should look like. The following much larger drawing does, I think, give a better picture of its nose area:

It is based solely on the Ordnance blueprint (available in our Tech Issues section) with the exception of the ambiguity of the actual height of the tensioning wall, Area C.
Regards
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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