It might be too much to ask a .40/10 breechface to accommodate 9mm, but a buddy has such a gun, and it seems to work.
A 9mm-specific breechface would not work with Super.
I think I'd want a breechface no larger than .38 Super dimensions, for a convertible Super/9mm.
You could load .38 Super Comp brass, use a 9mm breechface, and probably not have to worry about extractor swapping.
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Runs off at the mouth about anything 1911 related on this site and half the time is flat out wrong.
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