It was my understanding that at one time the .40 could be converted to .357, and also to a 9mm with drop in barrels, but not the other way around. But I see now that the .40 replacement barrel also fits as a conversion barrel for a .357 pistol.
If you really want to save some money get the 9mm conversion barrel. It is advertised to fit the .357 also. You will have to get the 9mm mags for it.
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