Any news or final answers on the 9mm barrel in .40 slide issue? - 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; I'm having a [cough] discussion about this on another forum. Has it been definitely determined that the practice of using a stock 9mm barrel in ...


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Old June 15th, 2014, 02:55 PM   #1
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Any news or final answers on the 9mm barrel in .40 slide issue?

I'm having a [cough] discussion about this on another forum. Has it been definitely determined that the practice of using a stock 9mm barrel in a .40S&W slide causes problems down the road with wear and so forth?

I wouldn't do it myself as I know S&W is against it, and I'm under the impression that people have had problems in the past. Is it just a case that it _seems_ to work for a while? Is there any quotable evidence documenting the pro or con position on the practice? Thanks!
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Old June 15th, 2014, 04:23 PM   #2
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There wouldn't be any more wear from using a conversion kit than that of shooting .40.
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Old June 15th, 2014, 06:25 PM   #3
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I took a guy to the emergency room after a factory 9mm barrel unlocked early and seriously injured his hand. He's since given up on firearms, and S&W refused to repair his M&P40.
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Old June 15th, 2014, 06:59 PM   #4
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Quote:
Originally Posted by wrinkles View Post
There wouldn't be any more wear from using a conversion kit than that of shooting .40.
Just to be clear, I'm talking about using a STOCK S&W manufactured 9mm barrel in a .40S&W slide...not a conversion barrel.

I'm talking to people that see no problem with doing this...I think they are wrong, based on discussions I've seen here. I am looking for some definitive information...descriptions of undue wear, reports of breakage, whatever.
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Old June 15th, 2014, 07:44 PM   #5
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I bought a Storm Lake 40-9 conversion barrel. The extra cost offsets the risk in my opinion many times over. I don't think a right and wrong discussion in this case will ever be resolved. It comes down to what personal preferences and risks each person is willing to take.
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Old June 15th, 2014, 09:03 PM   #6
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Quote:
Originally Posted by Token View Post
I'm having a [cough] discussion about this on another forum. Has it been definitely determined that the practice of using a stock 9mm barrel in a .40S&W slide causes problems down the road with wear and so forth?

I wouldn't do it myself as I know S&W is against it, and I'm under the impression that people have had problems in the past. Is it just a case that it _seems_ to work for a while? Is there any quotable evidence documenting the pro or con position on the practice? Thanks!
I to am in a similar discussion with the Shield on another forum. All I know for certain is that the 9mm does not fit as tight in the slide as the original .40 barrel, so I personally would not do it. It might work great, until the first time it doesn't, then you've got a huge problem. I'm not willing to take that chance, evidence or not.
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Old June 16th, 2014, 04:25 AM   #7
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If you value your dominant hand. Buy a conversion barrel.

If you're NOT that fond of everything you do with your dominant hand... save yourself $60.

'Nuf said.

Don't be a fu__ing idiot.
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Old June 16th, 2014, 10:02 AM   #8
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Quote:
Originally Posted by KRWeiss View Post
I took a guy to the emergency room after a factory 9mm barrel unlocked early and seriously injured his hand. He's since given up on firearms, and S&W refused to repair his M&P40.
This seems to be pretty definitive!

It might not help you win the argument, but it's best not to argue with idiots anyway!
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Old June 16th, 2014, 01:38 PM   #9
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"Don't be a fu__ing idiot"

What he said

+10
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Old June 16th, 2014, 01:47 PM   #10
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Quote:
Originally Posted by Token View Post
Just to be clear, I'm talking about using a STOCK S&W manufactured 9mm barrel in a .40S&W slide...not a conversion barrel.

I'm talking to people that see no problem with doing this...I think they are wrong, based on discussions I've seen here. I am looking for some definitive information...descriptions of undue wear, reports of breakage, whatever.
You don't use stock S&M 9mm in a .40, plain and simple. The dimensions are different, it's an accident waiting to happen.
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Old June 16th, 2014, 03:04 PM   #11
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I'm waiting for someone to justify chancing it with the OEM barrel all in the name of being a cheapass.

I sometimes wonder why S&W doesn't make their own 9mm conversion kit for the 40/357.

Last edited by jasonuscg; June 16th, 2014 at 03:07 PM.
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Old June 17th, 2014, 02:19 AM   #12
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The 9mm OEM barrel is about .017" narrower than the .40S&W on the flat sides where the caliber is stamped into the top of the barrel. Too much slop in my opinion to safely run this for any number of rounds. It'll probably work but accuracy would suffer and the barrel wouldn't truly lock in as it's designed to do. Spend the extra cash in my opinion.
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Old June 17th, 2014, 04:55 AM   #13
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I've used the analogy before...

You CAN put light truck tires on your F350 Heavy Duty truck. They fit on the rims. Running down the highway at 55 with no load in the bed, or not trailer on behind.. they work fine!

Now load up the bed full of concrete blocks and take it down a gravelly road with switchbacks and a ravine down the side... I'm guessing you'll want the CORRECT tires for the vehicle, which cost twice as much.

Just because the 9 barrel will fit in a 40 slide, doesn't mean it's safe.

My right hand is my SECOND favorite appendage on my body. It's worth every nickel of the $150 I spent on a REAL Storm Lake 9mm conversion barrel. If your right hand is unimportant to you, not worth $150... go ahead... be an idiot and shoot a 9mm barrel in a 40 slide. Good luck! You PROBABLY won't lose your hand.

Jeff
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Old June 26th, 2014, 07:30 PM   #14
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I feel like I am missing something here. Is the discussion whether dropping a S&W OEM 9mm barrel into a .40 Shield is safe? Or is it about dropping in ANY aftermarket 9mm barrel? OR.......is the Storm Lake 9mm barrel considered a safe conversion to a .40 Shield?

If so....... does the Storm Lake 9mm conversion barrel have all the correct dimensions? ie It is not .017" thinner at the flat sides?

And if the Storm Lake is the good way to go....100% safe etc...... do you use the OEM 9mm magazines?

Lastly....doing this conversion......does it void the S&W warranty?

When I first heard about the ability to drop in a 9mm barrel to a .40 Shield.....I thought it would be kinda cool to be able to do this....... but honestly, now that I have the Shield .40 and think about it, I don't see the point. I bought the gun in .40 'cos I wanted more ooomph! than my 9mm and more conceal-ability than my .45 SA 1911 Loaded full size.
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Old June 26th, 2014, 08:32 PM   #15
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Its about dropping an OEM 9mm barrel in a 40, the OP didnt specify model. The SL 9mm conversion barrels are made to the same dimensions as the 40 barrel. There is NO conversion for the Shield, so that's usually where all the fuss is. If you're talking about a Shield, then your other questions aren't applicable. SL shows conversions for the Compact, FS, and Pro, on those I would use actual 9mm mags, I think the 40s would work, but that's just me. I'm not sure about the warranty with the SL conversion barrel, but would think you'd be SOL, if you dropped a factory 9 in a 40, and then had a major problem. l Really don't know though. Hope that helps. There are others here that have more experience than I do, and may have something else to add, or correct me on.
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