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07-31-2011, 03:15 PM
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Converting M&P 40c to 9mm
I read somewhere that you can convert an M&P 40c to a 9mm by using a Storm Lake 40SW TO conversion barrel kit.
BARRELS SLBSWMPC9C358
STORM LAKE BARRELS S&W M&P COMPACT 40SW TO 9MM CONVERSION BARREL KIT - SLBSWMPC9C358
Is there any trick to this? or is it just a matter of inserting the 9mm barrel?
My main reason is to save money at the range. But continue to use the 40 cal for carry.
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07-31-2011, 03:38 PM
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Can be done-also have to buy the 9mm mags though!!!
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07-31-2011, 04:56 PM
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Other than getting the 9mm mags, is there nothing more to do than put the new barrel in the frame?
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07-31-2011, 05:46 PM
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While the conversion barrel is designed as a drop-in, there is no absolute guarantee that it will. My gunsmith tells me there have been a few that needed a touch of fitting. If you have any problems, you can discuss them with Storm Lake before taking it to a gunsmith. If you don't have any problems, then happy shooting!
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08-01-2011, 05:57 PM
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"you can discuss them with Storm Lake before taking it to a gunsmith"
For an advertised drop-in barrel, I sent my SL 9 mm barrel back twice to them before I could even chamber a bullet. My take is that you shouldn't have to take it to a gunsmith, particularly given how popular this particular barrel is, it should be made right. They paid for shipping, but it took at least 2 months before I had a working barrel. With the cost of ammo, I am now a happy camper at the range. It fires all day with no problems. I bought the FS 9 mm mags with X-grips, so I have less time loading.
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08-01-2011, 05:59 PM
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I just purchased a complete top end with a few mags. Works fine for me. I was going from a 9c to a 40c. 40 & 357 Sig can be done with standard barrel changes and the mags are the same. 40 to 9 has to have a conversion barrel or different top end.
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08-01-2011, 11:21 PM
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I use a factory S&W 9mm Compact barrel in my 40c with 9mm magazines. While I would not depend on it for defensive purposes, I have probably put close to 1K practice rounds through it without any problems.
I measured the barrels against each other with digital calipers and they were within a few thousandths in all critical dimensions.
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08-02-2011, 11:27 AM
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There is a good write up if you search for it where the guy compares two factory barrels and they are so close that many just drop in a factory 9mm for $65. I have heard about more problems using the Storm conversions than a factory 9mm barrel, but maybe more people try the Storm barrel, I don't know.
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08-02-2011, 05:00 PM
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I have had no issues with my factory 9mm barrel
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08-03-2011, 10:16 AM
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I have a 357c and use the 40c factory barrel in it. I also have a factory 9c barrel I use. There has been no problems for me thus far. Of course you have to get magazine for the 9mm. I will carry any of them as my defense rounds. However, that being said I mainly carry 357 just because I like the round for my needs and wants. Would I feel scared carrying my 9mm barrel in my 357 not at all. Plus the factory barrels are cheaper and drop in.
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08-03-2011, 11:16 AM
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I have no experience with the C, but my MP40 runs 9mm great with just a factory 9mm barrel and mag installed. 100% reliable with 115 and 124 FMJ so far (I have not shot any JHP through it because I just intend this as a cheap practice setup).
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06-09-2014, 03:04 PM
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Using stock 9mm (c) barrel in 40c
Quote:
Originally Posted by Lost Lake
There is a good write up if you search for it where the guy compares two factory barrels and they are so close that many just drop in a factory 9mm for $65. I have heard about more problems using the Storm conversions than a factory 9mm barrel, but maybe more people try the Storm barrel, I don't know.
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What about the recoil spring. Doesn't the spring for the 40c expect more recoil force to cycle properly?
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06-09-2014, 06:35 PM
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Nope. the .40c and the 9c use the same recoil spring.
Yellow end.
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02-11-2015, 09:23 AM
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Quote:
Originally Posted by Simmy952
I just purchased a complete top end with a few mags. Works fine for me. I was going from a 9c to a 40c. 40 & 357 Sig can be done with standard barrel changes and the mags are the same. 40 to 9 has to have a conversion barrel or different top end.
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When you say "top end" do you mean the slide assy., with barrel and spring?
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02-11-2015, 03:04 PM
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OP, you might give S&W a call and see if you can buy a factory barrel from them. Depending on who you talk to you might get lucky as I did a few months ago.
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