Thread: M&P 40 S&W to 9mm Conversion w/ KKM Barrel
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Old 04-08-2013, 07:31 PM
MSG Glenn MSG Glenn is offline
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You very definitely need 9MM mags for a 9MM conversion of a .40 cal M&P. If you convert a .40 to .357sig you can use the same .40 cal mags. The same mags are used in M&P .40 cal & .357sig.

Some have used .40 cal mags with a 9MM conversion with mixed results. Use it only at the range & expect feed problems. Never use them for SD carry unless you have 9MM mags.
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Last edited by MSG Glenn; 04-19-2013 at 08:59 PM.
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