Bar-Sto makes XD conversion barrels but they convert the .40/.357 to 9mm, not 9mm to .40. They are expensive too. Usually that's the way they convert...from a larger to a smaller chambering instead of vice versa.
Firedragon makes conversion barrels. They are very nicely made and reasonably priced. I have a 9MM conversion barrel for my XD SC in .40 cal.
You can convert .40 or .357 Sig to 9MM. You can get drop in .40 barrels for .357 Sig, and vice versa. Just can't go from 9MM to .40. It is a breechface problem. Too little.
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