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Old 03-06-2011, 10:41 PM
some_guy some_guy is offline
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Default M&P 40 -> 9mm conversion

wondering what , if any, conversion kits people have used. looking to also shoot 9mm in my .40 cal..

also - does anyone know of a .22lr conversion for these?

thanks in advance
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Old 03-06-2011, 11:41 PM
Backon4 Backon4 is offline
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All you need is a factory 9mm barrel and 9mm mags. It is quite easy.
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Old 03-07-2011, 01:59 PM
8th SPS USAF 8th SPS USAF is offline
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Default 40/9 conv

I was under the idea you needed a 40/9 conv bbl? I bought a Storm
Lake and it works great. I thought the hood was smaller on the 9mm bbl?
And the bbl diameter also?
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Old 03-08-2011, 05:10 AM
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SMMAssociates SMMAssociates is offline
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My understanding is that the breech face for the 9mm is a little smaller than the .40.... However, it should work anyway.

I don't think you can go the other way, though....

The Storm Lake barrels come well recommended, and I think will fit better than an S&W "parts" barrel.

I put a 9C slide & barrel on top of a 40C frame (and vice versa) with no issues at all. The 9C turned up with a thumb safety that I preferred on the 40C.

AFAIK, the recoil springs are the same. You will need 9mm magazines, too....

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