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M&P caliber change .357 Sig to .40S&W ?s
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05-12-2010, 12:26 PM
philmontscout
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My understanding is that they can be dropped in. Since the 357 is from the .40 case to begin with, you can use the 357 mags for 40.
Others may know more about this, but this is what i have heard
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