9mm barrel in a 40 S&W - MP-Pistol Forum

9mm barrel in a 40 S&W

This is a discussion on 9mm barrel in a 40 S&W within the MP Full Size Pistols forums, part of the Smith & Wesson MP Forum category; 3 years ago a thread was posted here ( M&P 40 full size to 9mm conversion). It gave good evidence that using a stock 9mm ...


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Old February 5th, 2017, 06:06 AM   #1
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9mm barrel in a 40 S&W

3 years ago a thread was posted here ( M&P 40 full size to 9mm conversion). It gave good evidence that using a stock 9mm barrel in a 40 S&W could be dangerous. I wish I had found it when I was recently scouring the web for information on this issue.
I bought a S&W 9mm barrel and have been excited to shoot it in my 40. Checked out several online sites and was even assured by so called experts that it was safe to shoot the 9mm in the 40 with several shooters attesting to that fact by shooting hundreds of rounds without problems.
As stated in the above thread "In the rear portion of the slide, the notch at the back of the chamber hood is wider on the 40 slide, hence the external differences in the barrels. A 40 barrel will NOT go into battery in a 9 slide, and a 9 barrel will not lock up completely in a 40 slide."
In placing my 9mm barrel in the 40 slide it does slide side to side in lockup; it might be possible to have the firing pin hit on the very edge for a misfire. I also wonder if a side to side force could be produced which might actually damage the gun. Your thoughts?
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Old February 5th, 2017, 07:53 PM   #2
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buy a kkm conversion barrel and don't worry is what I did. I have one for all three an accuracy seems better too.
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Old February 6th, 2017, 03:05 AM   #3
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For the few cents difference in ammo
Ill shoot 40 out of my 40'and IF I want to shoot 9mm I will acquire a 9mm handgun.




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Old February 9th, 2017, 02:29 PM   #4
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I've fired my 9mm barrel out of my .40 slide without ever having an issue - not really advisable. Having said that, I eventually got a slide for my 9mm barrel so I could just swap uppers depending on caliber I want to shoot. Generally it's cheaper to just buy a dedicated gun for each caliber but my lower has a lot of mods and I love how it feels. It was cheaper for me to just swap uppers and keep the lower the same than replicate the same mods on another gun.
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Old February 10th, 2017, 05:16 AM   #5
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Quote:
Originally Posted by Texas45 View Post
For the few cents difference in ammo
Ill shoot 40 out of my 40'and IF I want to shoot 9mm I will acquire a 9mm handgun.




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Exactly that...!
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