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Old 08-08-2013, 03:19 PM
rsrocket1 rsrocket1 is offline
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Location: DFW Texas, a free state!
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40 to 9 works fine for all the real posters I've read (including me)
9 to 40 does not work without modifying the slide.

the 40 mags work with 9mm in a few instances (not me), but using a factory 9mm barrel with factory 9mm mags in an M&P40 works flawlessly for me (about 3k rounds so far).
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