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Old 08-12-2017, 03:50 PM
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Default M&P 40 to 9 ?

Other than the barrel is there any difference in the recoil spring or other part's????
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Old 08-12-2017, 04:21 PM
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From what I understand just barrel and mags
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Old 08-12-2017, 04:39 PM
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No difference. They use the same springs. I've put a factory barrel in mine and it works fine.
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Old 08-13-2017, 02:25 PM
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Originally Posted by Rastoff View Post
No difference. They use the same springs. I've put a factory barrel in mine and it works fine.
Is there a significant difference in accuracy compared to the 40 barrel?

I got a 9mm barrel from Brownell's for $62 and haven't been to the range yet to try it out, but just putting it in the slide, can see it wiggle a bit from side to side. I'm not a super good shot, so it might not matter too much if there's a small amount of side to side slop.
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Old 08-13-2017, 09:42 PM
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Quote:
Originally Posted by Cheapskait View Post
Is there a significant difference in accuracy compared to the 40 barrel?
Well, it all depends on what you mean by significant.

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Originally Posted by Cheapskait View Post
...just putting it in the slide, can see it wiggle a bit from side to side.
This is completely unacceptable. The barrel should not move at all when fully in battery. If it's just sitting in the slide with the slide off the gun, there might be some movement. However, with the barrel properly installed in the slide, the slide properly installed on the gun and fully forward (in battery), the barrel should not move at all. If it does, your barrel does not fit the slide and I would recommend not shooting it. It might work, but it's certainly not right.

For practical purposes, the accuracy I see from the 9mm barrel in my .40S&W gun is decent. I would say it's as good as the .40S&W barrel. This is all with cheap ammo and not further than 10 yards and from a standing position. I have no checked it from a rest.

Now, there are some differences. Let me show some pics:
Here is the .40S&W installed in the .40S&W slide.


Here is the 9mm in the same slide.


See the gap in the 9mm barrel hood? Here are the measurements of that same spot for both barrels:
.40S&W


9mm


Even so, when installed properly, and fully in battery, it should not move. Mine doesn't.
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Old 08-13-2017, 09:50 PM
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I have a S&W factory 9mm barrel for my 40c, dropped right in, use 9mm magazines for 9mm ammo and .40 magazines for .40 ammo, no problems.
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Old 08-13-2017, 10:03 PM
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Originally Posted by Rastoff View Post
Well, it all depends on what you mean by significant.

This is completely unacceptable. The barrel should not move at all when fully in battery. If it's just sitting in the slide with the slide off the gun, there might be some movement. However, with the barrel properly installed in the slide, the slide properly installed on the gun and fully forward (in battery), the barrel should not move at all. If it does, your barrel does not fit the slide and I would recommend not shooting it. It might work, but it's certainly not right.

For practical purposes, the accuracy I see from the 9mm barrel in my .40S&W gun is decent. I would say it's as good as the .40S&W barrel. This is all with cheap ammo and not further than 10 yards and from a standing position. I have no checked it from a rest.

Now, there are some differences. Let me show some pics:
Here is the .40S&W installed in the .40S&W slide.


Here is the 9mm in the same slide.


See the gap in the 9mm barrel hood? Here are the measurements of that same spot for both barrels:
.40S&W


9mm


Even so, when installed properly, and fully in battery, it should not move. Mine doesn't.
I'm in agreement with you here Rastoff.
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Old 08-14-2017, 12:06 AM
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It "wiggles" when the barrel is just sitting in the slide without the recoil spring installed or slide mounted on the frame.

I'll try assembling it fully now...

OK, with the S&W factory 9mm barrel in the fully assembled Franken40, it doesn't move by pushing left and right by applying finger pressure on the top of the barrel locking block (the part that locks into the ejection port).

By pressing strongly on the right side of the locking block, I can feel the barrel kind of click over a tiny bit and then by prying on the left side it clicks to the right, it's pretty small amount of movement. When I work the slide, it falls back into the center, at least that's what it seems like.

I hand cycled my new 17 round magazine and my 2 12 rounders with ammo and the mags feed FMJs, at least by hand.

I note that when I put the 40 barrel back in, the barrel can forced to the left and right a little bit too, it feels less than with the 9mm barrel.

I'll try to make it to the range tomorrow. I hope it doesn't blow up.

I could have gotten a Storm Lake barrel made for the 40 slide for $90 more. Cheapskatism is a horrible illness that often causes me to wind up spending more money, not less.
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Old 08-14-2017, 03:39 PM
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Smile 9-40

Factory 9 Barrel in Shield 40 works fine. Has for years. You really do not even need the 9mm mags for it to work.
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Old 08-14-2017, 06:47 PM
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I put about 120 9mm rounds through it (0 problems) after shooting 50 rounds of 40. I can't say that it's more accurate with the looser 9mm barrel, but I'm more accurate with it in 9mm, a lot.

Call me Flinchy McFlinchy.

If it tests out reliable with SD ammo, I don't see why you couldn't carry it with the 9mm barrel with confidence.
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Old 08-14-2017, 09:38 PM
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Quote:
Originally Posted by shoots View Post
Factory 9 Barrel in Shield 40 works fine. Has for years. You really do not even need the 9mm mags for it to work.
In all honesty, you're correct . But, why risk something happening to you or someone else? If I were to do what you stated in your reply I could not sleep at night. You might find my reply trivial, I call it practicing SAFE FIREARM TECHNIQUES!
This is my Storm Lake .40 to 9mm conversion barrel. It fits very nice and tight with no wiggle-AKA-play at all.

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  #12  
Old 08-15-2017, 01:07 AM
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Recoil springs were different in later models. 9mm came with the blue painted springs which were 16lbs I believe and they started putting the green painted springs from the .357 sigs in the .40's which are reported to be about 17lbs. Not a big difference there though unless you use really low powered ammo. .40's apparently used to come with the blue painted 16lb.

EDIT: This is for the regular full sized models BTW
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  #13  
Old 08-15-2017, 09:41 AM
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The recoil spring in my 40c is kind of a greenish yellow or yellowish green. Whatever the weight is, the 9mm casings ejected with authority and the slide locked back on an empty magazine even though I was shooting mild 115gr AL Blazer and Fed Champion.
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Old 08-15-2017, 08:04 PM
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The recoil spring in my 40c is kind of a greenish yellow or yellowish green. Whatever the weight is, the 9mm casings ejected with authority and the slide locked back on an empty magazine even though I was shooting mild 115gr AL Blazer and Fed Champion.
Yeah, not sure what the spring weights are in the compacts, but they are usually heavier than in full sized models... My post was referring to the full sized models. I have seen those yellow compact springs but the green in the FS models is more of a neon green.
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Old 08-15-2017, 09:31 PM
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I can't say that it's more accurate with the looser 9mm barrel, but I'm more accurate with it in 9mm, a lot.
Yes, lower recoil will do that. I'm glad you're happy with it.

Now go shoot...A LOT!!!
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Old Yesterday, 02:04 PM
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M&P M2.0 in .40s&w with a .40-9mm Storm Lake conversion barrel & 9mm magazines everything should run just fine?
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Old Yesterday, 02:56 PM
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M&P M2.0 in .40s&w with a .40-9mm Storm Lake conversion barrel & 9mm magazines everything should run just fine?
Yep!

(That's all I was gonna say but I guess the forum has a minimum of 13 characters...)
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Old Yesterday, 03:35 PM
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The biggest potential problem with this conversion I can think of is the fact that during extraction, I can see how the base of 9mm fired case might shift to the left because it's unsupported by the corner of the breechface and could slip out from under the extractor and cause a FTE especially with "sticky" cases like the Russian steel stuff.
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Old Yesterday, 04:40 PM
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The biggest potential problem with this conversion I can think of is the fact that during extraction, I can see how the base of 9mm fired case might shift to the left because it's unsupported by the corner of the breechface and could slip out from under the extractor and cause a FTE especially with "sticky" cases like the Russian steel stuff.
Valid point. I don't have a conversion for any of my M&P's yet so I can't say if it would cause any issues.

The only thing I think of when I go through the extraction process in my head is that the spent casing would be held straight by the chamber until it is almost clear and by that time i would think there would be sufficient momentum for a pretty clean extraction. Especially since the case would have expanded to the chamber diameter taking out any chamber slop that would have been present prior to firing.

I wish I had access to high speed camera.... It would actually be really interesting to see the extraction process of a gun with a conversion barrel from the top in super slow motion. Just because I'm a nerd like that.
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Old Yesterday, 05:02 PM
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Quote:
Originally Posted by Smakmauz View Post
Valid point. I don't have a conversion for any of my M&P's yet so I can't say if it would cause any issues.

The only thing I think of when I go through the extraction process in my head is that the spent casing would be held straight by the chamber until it is almost clear and by that time i would think there would be sufficient momentum for a pretty clean extraction. Especially since the case would have expanded to the chamber diameter taking out any chamber slop that would have been present prior to firing.

I wish I had access to high speed camera.... It would actually be really interesting to see the extraction process of a gun with a conversion barrel from the top in super slow motion. Just because I'm a nerd like that.
I tell you what, tomorrow when I'm shooting my MP .40 with the .40 to 9 conversion barrel, I will do my best "to watch" the extraction process and report my findings back to you.
(You do know I'm just joking, right? )
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Old Yesterday, 05:07 PM
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That all of a sudden reminds me of those tip-up barrel Beretta guns that actually have no extractors at all. Maybe blowbacks have less need of extractors than recoil operated.
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Old Yesterday, 06:21 PM
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Yep!

(That's all I was gonna say but I guess the forum has a minimum of 13 characters...)

Even better then a Glock, thanks!
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Old Yesterday, 06:28 PM
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Actually, wouldn't the .357sig Storm Lake barrel be a better fit then a .40-9mm conversion barrel, as far as lockup & the extraction goes?
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Old Yesterday, 08:57 PM
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Actually, wouldn't the .357sig Storm Lake barrel be a better fit then a .40-9mm conversion barrel, as far as lockup & the extraction goes?
Shouldn't be any different since the back end of the .357 sig cartridge is the same as .40 S&W. And the barrels are the same outer dimensions.
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Old Yesterday, 08:59 PM
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I tell you what, tomorrow when I'm shooting my MP .40 with the .40 to 9 conversion barrel, I will do my best "to watch" the extraction process and report my findings back to you.
(You do know I'm just joking, right? )
I'll expect your full written report on my desk at 07:00 Monday morning!!
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Old Yesterday, 09:40 PM
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Shouldn't be any different since the back end of the .357 sig cartridge is the same as .40 S&W. And the barrels are the same outer dimensions.
I was referring to the .357sig ejecting better then a 9mm would, due to like you said its the same as the .40s&w.
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Old Yesterday, 10:42 PM
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I was referring to the .357sig ejecting better then a 9mm would, due to like you said its the same as the .40s&w.
Oh yeah, gotcha, that makes sense. It very well might! Lock up would be the same on a conversion barrel but since the sig has the back end of a .40, the extraction shouldn't be different. Except maybe a bit faster because of higher velocities? If using the same recoil spring...
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