How can I convert a .40 S&W to 9mm?

How can I convert a .40 S&W to 9mm?

This is a discussion on How can I convert a .40 S&W to 9mm? within the Defensive Carry Guns forums, part of the Defensive Carry Discussions category; Hey guys happy Friday to ya' I'm wondering what I need to convert my Smith & Wesson M&P 40c to 9mm? I'm fine with the ...

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Thread: How can I convert a .40 S&W to 9mm?

  1. #1
    Member Array guitarzNgunz's Avatar
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    How can I convert a .40 S&W to 9mm?

    Hey guys happy Friday to ya' I'm wondering what I need to convert my Smith & Wesson M&P 40c to 9mm? I'm fine with the .40 but I was interested in converting to 9mm for practice at the range since 9mm is a little cheaper for the ammo.

    Thanks,
    Chris-gNg


  2. #2
    VIP Member Array zonker1986's Avatar
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    buy a 9mm conversion barrel from a manufacturer like Storm Lake and 9mm magazines for the M&P 9C and you should be set.

    StormLake | Build Your Barrel
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    VIP Member Array hogdaddy's Avatar
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    Quote Originally Posted by zonker1986 View Post
    buy a 9mm conversion barrel from a manufacturer like Storm Lake and 9mm magazines for the M&P 9C and you should be set.

    ^^^^^^YEP^^^^^^^^^^^^ Or Learn to reload ; )

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    Senior Member Array Luckey1115's Avatar
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    How boxes of ammo will it take to make a new barrel and mags worth converting?
    Never challenge an old man, because if you lose, you’ve lost to an old man, and if you win, so what?

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    VIP Member Array aus71383's Avatar
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    You'll need new magazines as well. If you do the math you'll probably realize it isn't a good way to spend money - but if you want it, then it is...

    Austin

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    Member Array Sontag's Avatar
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    Quote Originally Posted by zonker1986 View Post
    buy a 9mm conversion barrel from a manufacturer like Storm Lake and 9mm magazines for the M&P 9C and you should be set.
    What zonker1986 said.

    I did exactly that with my full-sized M&P. You can also buy a .357 sig barrel and use your .40 S&W mags. (My full-sized mags are stamped .40 S&W/357 Auto). 3 calibers in 1 gun.
    guitarzNgunz and blitzburgh like this.

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    Member Array MamaMaria's Avatar
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    Quote Originally Posted by aus71383 View Post
    You'll need new magazines as well. If you do the math you'll probably realize it isn't a good way to spend money - but if you want it, then it is...

    Austin
    +1 to this. $160 for barrel, $90 for magazines (assuming 3 at $30 each)=$250 + tax/shipping. YMMV, but I'd either suck it up and pay for .40S&W ammo, or more likely, I'd buy the M&P 9 to keep the 40 company. The more the merrier, right?

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    Member Array 02R1's Avatar
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    save a bit more and just buy a 9mm handgun

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    Member Array GetSmith's Avatar
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    Midway has the S&W stock 9mm barrel for $70. I have one on my .40 and it works great. When I go to the range I shoot 100 .22lr. - 80 9mm - 40 .40cal through my M&P's. The main reason I got the 9mm barrel was for more diversity in a SHTF situation. I would be a same to have a 40cal pistol and only 9mm ammo available. Buy the S&W barrel, you won't regreat it.
    guitarzNgunz likes this.

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    Member Array GetSmith's Avatar
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    Quote Originally Posted by 02R1 View Post
    save a bit more and just buy a 9mm handgun
    One of the great things about the M&P platform is how cheap and easy a barrel conversion is. Why buy a 9mm when for $100 more you can get a pistol that shoots 9mm and .40cal. I have two M&P .40 cal's with a 9mm barrel. I'm on a wait list for a .40 Shield and already have a 9mm barrel and mags for it.
    guitarzNgunz likes this.

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    Member Array guitarzNgunz's Avatar
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    Quote Originally Posted by hogdaddy View Post
    ^^^^^^YEP^^^^^^^^^^^^ Or Learn to reload ; )

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    Yes I'm working on getting reloading equipment.

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    Member Array guitarzNgunz's Avatar
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    Quote Originally Posted by Luckey1115 View Post
    How boxes of ammo will it take to make a new barrel and mags worth converting?
    Well I shoot ALOT! So it would be worth it after less than a year, and not only that I forgot to mention my wife is getting into shooting lately as well she's taking her CPL class tomorrow and my 40 is a bit to much for her. So converting to 9mm would be more enjoyable for her at the range too.

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    Member Array guitarzNgunz's Avatar
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    Quote Originally Posted by MamaMaria View Post
    I'd buy the M&P 9 to keep the 40 company. The more the merrier, right?
    I'm on the waiting list for the M&P Shield in 9mm but it's a LOOOOOONNNNNG list.

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    Member Array popo22's Avatar
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    You can buy a "conversion barrel" and 9mm magazines if you like but as stated you can shoot 9mm through your .40c by just buying a 9mm factory barrel. It is not necessary to buy a special "conversion barrel" or special 9mm magazines, it will work fine with just the factory 9mm barrel. I have put over 3k 9mm through my .40c using only a factory barrel without any issues. Good luck
    guitarzNgunz likes this.
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    Member Array Sontag's Avatar
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    Quote Originally Posted by popo22 View Post
    You can buy a "conversion barrel" and 9mm magazines if you like but as stated you can shoot 9mm through your .40c by just buying a 9mm factory barrel. It is not necessary to buy a special "conversion barrel" or special 9mm magazines, it will work fine with just the factory 9mm barrel. I have put over 3k 9mm through my .40c using only a factory barrel without any issues. Good luck
    It's good to know that the factory 9mm barrel works. I bought the conversion barrel because I was told that the outside diameter of the 9mm factory barrel is smaller than the OD of the .40/357s barrels, so the factory 9mm barrel would be a loose fit in the barrel opening of the .40/357s slide. If you have a micrometer and can measure both, I would like to know if they are the same. If they are, I may add a factory S&W 9mm barrel to my Christmas list; I don't really care for the finish on my Storm Lake conversion barrel.

    Thanks to popo22 and GetSmith for the great info.
    guitarzNgunz likes this.

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