40/357
BrianE-I do not see anyone answered your question, but from what I have seen, the 357 Sig amd the 9mm conversion barrels only drop into the 40, and not vice versa.
Unfortunately I did not realize that the 40 would allow you to do that when I bought my M&P9 a year ago, or I would have probably gotten the 40 and the extra barrel(s).
And around here, the .357 is pretty hard to come by in the WalMarts, and is more expensive than either 40/45.
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