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Smith & Wesson M&P Pistols All Variants of the Smith & Wesson M&P Auto Pistols


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Old 04-06-2012, 08:20 PM
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Default Caliber conversion

Is it possible to convert an S&W M&P compact from 9mm to .40 S&W with just a barrel and mag swap?

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Old 04-06-2012, 08:35 PM
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In short no it is not but in the other case it is from 40 cal to 9mm.

You can buy a 40 and convert either to a 9mm or a 357SIG which is what I have done with my S&W M&P40C using a Storm Lake 357SIG barrel which I just tested this afternoon at the range and was very impressed. I also have a post about why you should buy a compact M&P and most of all a M&P40C for this versatility!
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Old 04-07-2012, 10:50 AM
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Thanks, I thought the barrels were the same diameter. Appreciate the info.
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Old 04-07-2012, 12:00 PM
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Barrels are the same but the breech face is different. That's why you can go down but not up.
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Old 04-07-2012, 12:42 PM
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Gotcha. Thanks. I have downconverted a couple of Glocksj and a Browning Hi Power, and that's the way you have to do it. Appreciate the help.
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Old 04-07-2012, 09:26 PM
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As with most weapons especially the M&Ps you can buy a compact and use a full sized magazine but not the other way around.

Had I known what I just said above a few years ago I would have said buy a M&P compact and be happy with your purchase, but no I bought a full size 9 which I love a bunch but had I done it differently then yes that would have been my choice!
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