Quote:
Originally Posted by scattershot
The barrels are the same diameter. The reason you can't switch from 9mm to .40 is the breechface on the 9 is too small to accommodate the .40 case.
Glocks are different sizes, but on the M&P they are the same size.
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Read these threads.
I have heard that some have narrowed the 40 tang to fit a 9 slide. (there is a thread somewhere but I can't find it)
Questions on M&P40c conversion to 9mm
Stock 9mm Barrel vs Storm Lake 9mm Conversion Barrel