Quote:
Originally Posted by mtnwinds
I installed a 9mm factory barrel in my M&P 40FS and my wife used it the next day to qualify for her CHL.
I would not recommend converting a 9mm pistol to 40. That would require milling the sides of the 40 barrel to fit the 9mm slide, effectively reducing the thickness of the chamber walls. If I wanted that conversion I would buy a 40 slide assembly.
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Why do you think that? As I posted above, the exterior dimensions of the two factory barrels are identical. At least for a full sized gun it should be just as easy to convert either way.