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05-17-2016, 06:43 PM
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Join Date: Nov 2013
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M&P .40/.357 Sig Conversion
Purchased a S&W M&P .357 Sig barrel and installed it in a M&P .40 S&W slide. I am assuming that the .40 slide be used to fire .357 Sig cartridges--is this correct?
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05-17-2016, 07:22 PM
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Join Date: Jan 2003
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Yes and the same mags.
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05-17-2016, 07:38 PM
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Yep, no other changes required....and I'm embarrassed to say that I can tell you from experience that the .357 sig round can be fired from that 40 S&W barrel if you get distracted. Even cycled the slide.
__________________
Dave
Last edited by Wee Hooker; 05-17-2016 at 08:00 PM.
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05-17-2016, 08:42 PM
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Quote:
Originally Posted by Wee Hooker
Yep, no other changes required....and I'm embarrassed to say that I can tell you from experience that the .357 sig round can be fired from that 40 S&W barrel if you get distracted. Even cycled the slide.
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It sure can. Seen it happen, ehh, to someone I know 
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05-18-2016, 06:46 AM
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I thought the .357 guns got a different recoil spring?
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05-18-2016, 07:43 AM
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Sadly, I have had the .357 Sig barrel myself for about 3 weeks now but still haven't tried it out in my 40FS. Gotta get that done soon!
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05-18-2016, 12:57 PM
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Quote:
Originally Posted by jackrabbit000
9mm/.40/.357 uses the same recoil spring. S&W part #279740000
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What happened to the green spring? Did S&W just drop it when they dropped 357 Sig and call the blue spring "good enough"?
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05-18-2016, 05:40 PM
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Quote:
Originally Posted by Caliper
What happened to the green spring? Did S&W just drop it when they dropped 357 Sig and call the blue spring "good enough"?
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I do wonder that myself since my .40 has a different color spring than my 9mm guns. I assumed that it meant a different weight. I never looked into the color, though, since the best I could determine online is that they all use 16# springs.
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05-18-2016, 09:27 PM
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US Veteran
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Join Date: Apr 2016
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I was lucky enough to get the 9mm barrel from Midway at the end of April. My next quest is the 357 Sig, I just wish it was available for $65.99 like the 9mm.
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05-18-2016, 09:50 PM
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Quote:
Originally Posted by iouri
It sure can. Seen it happen, ehh, to someone I know |
You're "friend" 
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05-19-2016, 06:01 AM
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Quote:
Originally Posted by Model63
I was lucky enough to get the 9mm barrel from Midway at the end of April. My next quest is the 357 Sig, I just wish it was available for $65.99 like the 9mm.
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It's something like $85. I recently got a factory 357 barrel from Midway.
But, like others, life has gotten in the way of shooting it yet.
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