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Can you convert an M&P .40 into .357 sig and 9mm quickly and easily like you can a glock 22 or 23?
 

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to convert from a.40 to 9 mm you will need new mags in 9mm for reliability and a new barrel.. thats it.. if you can find a stock M&P 9mm barrel that will work as the outside diameter of the forty and nine are the same, the bore size is just different, if not a good barrel from storm lake will work as well.
 

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Can you convert an M&P .40 into .357 sig and 9mm quickly and easily like you can a glock 22 or 23?
YES!!!!

I have a M&P .40 Full size. The Magazines fit .40S&W and .357SIG. I bought a barrel from S&W for 75.00. It drops directly in, and uses the same recoil spring. Two guns in one :)

You could also look at aftermarket barrels from Storm Lake. They come in stainless, can be ported, or threaded, depending on your application.
 

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I believe the .45 has a slightly larger frame than the 9mm, .40S&W, .357SIG variants. The head diameter would also be a big change in that case. I do not think it can be converted as easily... but thats not to say it totally cannot be done. The 9mm, .40S&W, .357SIG variants are easily interchangable.
 
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