Dwight,
I seriously doubt that the flange diameter would vary more than .25 mm or about .010" this is considering that the tolerance would be in the range of "+ or - .005" or "0.1 mm" which is about standard for non critical mating surfaces.
This amounts to about the thickness of two sheets of high grade writing paper.
Barely perceptable to the feel of the finger tips.
It is probable that the diameters would be set at a figure that would make the largest allowable dimension of the Barrel flange to be equal to the smallest allowable dimension for the Breech face, this would give the best appearance to the joint.
ViggoG
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