Any news or final answers on the 9mm barrel in .40 slide issue? - Page 2 - MP-Pistol Forum

Any news or final answers on the 9mm barrel in .40 slide issue?

This is a discussion on Any news or final answers on the 9mm barrel in .40 slide issue? within the MP Gunsmithing forums, part of the Smith & Wesson MP Forum category; You can't safely drop in a 9mm oem barrel in a .40 the the dimensions are different. The barrel will not lock up properly because ...


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Old June 27th, 2014, 05:11 AM   #16
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You can't safely drop in a 9mm oem barrel in a .40 the the dimensions are different. The barrel will not lock up properly because it's undersized at the locking block and will be undersized at the muzzle.
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Old June 27th, 2014, 12:11 PM   #17
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Originally Posted by wrinkles View Post
You can't safely drop in a 9mm oem barrel in a .40 the the dimensions are different. The barrel will not lock up properly because it's undersized at the locking block and will be undersized at the muzzle.
Concerning only the external dimensions, the only difference is the width of the barrel hood at the breech face.
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Old June 27th, 2014, 12:19 PM   #18
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Have you measured the height for the barrel from the locking are to the locking lug? How does it lock up at the breech? Is there sideways movement and up and down movement when locked? The OD of both barrels is the same at the muzzle?
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Old June 27th, 2014, 06:34 PM   #19
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Old June 27th, 2014, 10:38 PM   #20
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And that's the ONLY external difference. We really don't need folks without sufficient knowledge just making up crap trying to present this incompatability as being worse than what it is, because the plain truth is serious enough. Using a factory M&P9 barrel in an M&P40/357 slide has, and will continue to cause serious injuries.

Last edited by KRWeiss; June 27th, 2014 at 10:49 PM.
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Old June 28th, 2014, 06:15 AM   #21
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I bought a 9 mm factory barrel for my 40 FS based on a lot of other threads I have read and videos on this subject, but have yet to use it. I have since ordered a storm lake 40 to 9 conversion barrel. If it shoots as well as the 40, I will be .
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Old June 28th, 2014, 08:37 AM   #22
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The barrel locks up at the other end and at the bottom locking lug. Those dimensions a critical as to how the gun locks up and when it unlocks.

I know the drawings are bad but I don't have access to my photo editing software here.



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Old June 28th, 2014, 11:11 AM   #23
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The barrel locks up at the other end and at the bottom locking lug. Those dimensions a critical as to how the gun locks up and when it unlocks.
I'm not sure what this is attempting to prove.
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Old June 28th, 2014, 12:00 PM   #24
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I'm not sure what this is attempting to prove.

I'm trying to explain where the dimensions should be checked. The critical areas that must fit correctly.
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Old June 28th, 2014, 08:13 PM   #25
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Originally Posted by wrinkles View Post
I'm trying to explain where the dimensions should be checked. The critical areas that must fit correctly.
Putting aside any confusion about where the locking surfaces are, as I stated before, there is only the one external difference between the OEM 9mm and .40 S&W M&P barrels.
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Old November 14th, 2015, 09:05 PM   #26
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Want 9, buy a 9. If you want to prove you are stupid at least tell someone where you are are when you shoot the wrong barrel on purpose in the wrong gun. I have been around a long time because of Gods grace and not being stupid. I also like to read the instructions.
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Old November 15th, 2015, 10:27 AM   #27
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Want 9, buy a 9. If you want to prove you are stupid at least tell someone where you are are when you shoot the wrong barrel on purpose in the wrong gun. I have been around a long time because of Gods grace and not being stupid. I also like to read the instructions.
Also apparently you like resurrecting 1 plus year old threads as well.

As for proving one is stupid, shooting a Storm Lake 9-40 CONVERSION barrels is perfectly fine as the exterior barrel dimensions are designed to mate the 40 slide. A none conversion 9mm barrel does not.

I see you are a new member here. You are making a hell of an impression by calling out people as stupid and touting your superior comprehension skills.

Stay safe.

Last edited by lhawkins; November 15th, 2015 at 10:31 AM.
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Old November 25th, 2015, 02:35 PM   #28
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Also apparently you like resurrecting 1 plus year old threads as well.

As for proving one is stupid, shooting a Storm Lake 9-40 CONVERSION barrels is perfectly fine as the exterior barrel dimensions are designed to mate the 40 slide. A none conversion 9mm barrel does not.

I see you are a new member here. You are making a hell of an impression by calling out people as stupid and touting your superior comprehension skills.

Stay safe.
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I am not calling you "Stupid" or any one individual stupid. I would also say that you yourself are new here too with 30 posts.

Happy Holidays.
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Old January 27th, 2016, 11:08 AM   #29
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Originally Posted by jasonuscg View Post
Concerning only the external dimensions, the only difference is the width of the barrel hood at the breech face.
Ok so its well established that there is only one difference in the barrel dimensions between the 40 and 9.

However, peoples opinions seem to vary drastically weather this is an important difference or not. Some say my friend blew his hand off, others have thousands of rounds down range without problems.

Leaving the epeen out of it, credentials and all.... Has anyone looked at the Apex Tactical video regarding the install of their semi drop in 9mm barrel??? He says that the barrel hood width is not critical for lockup...

So then, why would someone not want to buy their 9mm barrel for a 40 and how would it be dangerous? The only way I could see a 9mm barrel being dangerous is if the lock up changes, which supposedly has nothing to do with the one dimension that is different.

Any thoughts?
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Old January 27th, 2016, 04:37 PM   #30
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Originally Posted by Inix View Post
Ok so its well established that there is only one difference in the barrel dimensions between the 40 and 9.

However, peoples opinions seem to vary drastically weather this is an important difference or not. Some say my friend blew his hand off, others have thousands of rounds down range without problems.

Leaving the epeen out of it, credentials and all.... Has anyone looked at the Apex Tactical video regarding the install of their semi drop in 9mm barrel??? He says that the barrel hood width is not critical for lockup...

So then, why would someone not want to buy their 9mm barrel for a 40 and how would it be dangerous? The only way I could see a 9mm barrel being dangerous is if the lock up changes, which supposedly has nothing to do with the one dimension that is different.

Any thoughts?
Why not just buy the 9 -> 40 conversion barrel and make the point moot? I mean, unless you have the 9 already laying around, you are probably going to need to buy a barrel. Why not just buy the right one?

I run a 9 SL conversion barrel and it runs fine in my 40 slide.
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