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In the Sig thread, many many pages, 1blindref bought what he described as "the poor mans Equinox, as, IIRC, Sig put together a few models with left-over slides but weren't as expensive as the real deal and something makes me think it was a 9mm as well, just don't recall if it was a P226 or 229, but he listed it with the pic of it in his, that, thread..
Might want to see if you can find it.. Lot's of good pics, and IF you find it, you could PM him about it..
And, as mentioned, 9mm barrel will not work in 40cal/slide - too big - O, barrel too small - 0
Luck,
Ls