M&P recoil spring update.

This is a discussion on M&P recoil spring update. within the MP Talk forums, part of the Smith & Wesson MP Forum category; I experienced problems with M&P pistols needing some break in period because the slide failing to move all the way forward. It seems like Smith ...


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Old June 28th, 2013, 06:17 PM   #1
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M&P recoil spring update.

I experienced problems with M&P pistols needing some break in period because the slide failing to move all the way forward.

It seems like Smith & Wesson acknowledged this problem, and started using heavier recoil springs.

The old ones were pained blue on one side.

The new one I've seen is painted green.

I can tell it's more stronger because it took noticeably more force to put the slide back on when I start to push the slide back against the recoil spring. I also confirmed the force required for the slide to move back from full forward position is higher with the new spring by pulling the front with the trigger gauge.

I'm happy to say that I had no problems with the one that came with this green painted spring.

It was a full size M&P 40.

Last edited by grayblue; June 28th, 2013 at 08:11 PM.
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Old June 28th, 2013, 10:13 PM   #2
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My FS .40 has a blue spring, with a born-on date of April 2013. I've experienced zero malfunctions with it.
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Old June 29th, 2013, 07:55 AM   #3
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Ditto. Dec 2012
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Originally Posted by GTS197 View Post
My FS .40 has a blue spring, with a born-on date of April 2013. I've experienced zero malfunctions with it.
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Old June 29th, 2013, 11:09 AM   #4
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[My FS .40 has a blue spring, with a born-on date of April 2013. I've experienced zero malfunctions with it. QUOTE=ginzo;360484]Ditto. Dec 2012[/QUOTE]

x3 blue spring, 6/22/2012 test fire date.
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Old June 29th, 2013, 11:35 AM   #5
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I use a lighter spring than stock in my MP pro 40 and have had no problems. i use a 13#
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Old June 29th, 2013, 12:44 PM   #6
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The recoil spring on my used M&P 40 is blue. I don't have any problems with it nor did the past owner. It saw police service with many rounds through it & I'm adding to the count.

Could it be that the new gun just has a tight slide that needs break-in? I've heard that those who use FrogLube find that their slide works easier..
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Old June 29th, 2013, 01:02 PM   #7
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The M&P9/40 generally comes with a blue spring, while the M&P357 often comes with a heavier green spring.
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Old June 29th, 2013, 08:46 PM   #8
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Even though most M&P with blue springs worked after break-in, I believe the M&P 40 line would have benefited if it came with the green spring in the first place. Yes, most of it worked after break-in, but the green spring would have eliminated the need for a break-in in the first place for all M&P I had problems with.

With the green spring, my M&P 40 almost recoils like a 9mm with Winchester USA.

It's not that your blue spring M&P will start breaking down, but the green spring made my M&P a better pistol.

It would make a lot of sense if S&W did this in the first place.

Last edited by grayblue; June 29th, 2013 at 08:51 PM.
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Old June 29th, 2013, 08:47 PM   #9
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Originally Posted by KRWeiss View Post
The M&P9/40 generally comes with a blue spring, while the M&P357 often comes with a heavier green spring.
I also see that was the case.

But, I don't get the logic of it.

40S&W generally recoils harder than 357SIG.
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Old June 29th, 2013, 08:54 PM   #10
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Originally Posted by MSG Glenn View Post
The recoil spring on my used M&P 40 is blue. I don't have any problems with it nor did the past owner. It saw police service with many rounds through it & I'm adding to the count.

Could it be that the new gun just has a tight slide that needs break-in? I've heard that those who use FrogLube find that their slide works easier..
Most new guns I have problems with, the problem did went away after break-in. But, this is 2013. We should not have to waste hundreds of dollars extra to make the gun work. And, simply using a better spring would have avoided the whole issue in the first palce, not that I am claiming it's a wide spread issue.

I also use Frog Lube.
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Old June 29th, 2013, 10:48 PM   #11
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Originally Posted by grayblue View Post
40S&W generally recoils harder than 357SIG.
Not exactly. The higher pressure/higher velocity 357Sig 125 gr. has quite a bit more energy than most 40S&W loadings (which impart more energy than 9mm and 45ACP), which translates into a stronger/sharper initial recoil pulse over a considerably shorter duration. Most shooters who shoot both report that the 357Sig has more perceived recoil than the 40S&W. The heavier M&P recoil assembly tames it well.
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Old June 29th, 2013, 11:11 PM   #12
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Not exactly. The higher pressure/higher velocity 357Sig 125 gr. has quite a bit more energy than most 40S&W loadings (which impart more energy than 9mm and 45ACP), which translates into a stronger/sharper initial recoil pulse over a considerably shorter duration. Most shooters who shoot both report that the 357Sig has more perceived recoil than the 40S&W. The heavier M&P recoil assembly tames it well.
It's loading dependent.

However, pressure and velocity does not always correlate to higher recoil. 9mm has higher pressure and velocity than 45ACP, but that does not mean 9mm recoils harder.

This is an opinion of Todd G from M4Carbine.net, who I belive is the same person from Todd Green of Pistol Training.com

Physics question - .357 SIG v. .40 - M4Carbine.net Forums

I have also read specific recoil force data regarding 357SIG loand and 40S&W loads. I can't find the data now, but it reflected the same idea that 357SIG recoild milder.
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Old June 30th, 2013, 12:01 AM   #13
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.357 SIG recoils less, oh really. Trying running the math on that with things that can be proven with solid science rather than conjecture. Calculate for impulse (lbs sec), velocity (fps) and energy in (ft/lbs).
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