It would require quite a bit of cylinder work, which would make it impossible to safely fire 38's in it afterward.
+100!!! I'll add this as well. A standard J-frame in .38spl/.357mag is just that a .357" bore. If you go the route of changing it over to shoot 9MM you'll need to find a SW940 barrel for it as well since 9MM is .355" and your accuracy will suffer shooting a smaller bore round through a larger bore barrel.
For as much trouble as it would take to modify the cylinder and to use a different barrel, it would seem to make more sense simply to get a complete S&W 940, right?
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