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Wolff Recoil Springs

This is a discussion on Wolff Recoil Springs within the MP Full Size Pistols forums, part of the Smith & Wesson MP Forum category; Hi everyone, This is my first post on the site. I have read a lot of the others on and off for the last year, ...


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Old December 23rd, 2016, 06:56 AM   #1
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Wolff Recoil Springs

Hi everyone,

This is my first post on the site. I have read a lot of the others on and off for the last year, but finally joined up.

I have a new M&P CORE with a KKM threaded barrel for my GM-45 that just won't run with the suppressor on it, except with very hot 115gr ammo.

With the factory recoil spring, using 147 gr ammo, there is not enough "umph" to cycle the slide to even eject the spent casing. So I purchased a Wolff Reduced Power Kit from Brownells and took it out last night.

Unfortunately, the springs were way too light and wouldn't consistently pull the slide back into battery. I also started seeing stovepipes and failures to feed with 115gr-147gr ammo. One thing that caught my attention was that the difference between the Wolff #15 and Wolff #14 springs seems very minor, but the difference between the factory #16 spring and the Wolff #15 seemed quite large.

I took the gun home and using a large piece of a socket wrench, crudely measured the spring compression strength my pressed my muzzle into the socket and into a scale. My factory spring measure between 16-16.5 lbs, but the Wolff springs were ALL 1.5-2 lbs lighter than advertised!!

I called Wolff and was basically told that their equipment is better than mine and that all springs are accurate within 2% of advertised strength. They recommended I return my order to Brownells and get an Extra Power kit.

My Reduced Power Kit is on its way back to Brownells, but I am really frustrated. I have never had to work so hard to get a pistol to run suppressed. I am hoping some people here might have some experience with this and be able to offer suggestions. I am happy to order the Extra Power Kit from Wolff, albeit I am very disappointed with their customer service.

Any help for a new forum member?

Thanks guys!!
Elliot
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Old December 23rd, 2016, 02:54 PM   #2
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Im Having the Same problem on my core and using SilencerCO Hybrid.I would get 1 or 2 FTE on five mag. I contacted SilencerCO and they told me use a Heaver Spring they said whats happing is the slide is going to fast due to the increases in back pressure. It sound counterintuitive, But I'm new to the Suppressor world.
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Old December 23rd, 2016, 02:55 PM   #3
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I was shooting AE 124 fyi
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Old December 23rd, 2016, 05:00 PM   #4
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What brand of ammo are you shooting when you have this problem? I would just tune it to run with 147g of whatever brand you're gonna use. I use the UMC 147g stuff and the stock spring when running suppressed (Octane 45...). It's been running fine but I might experiment with some slightly stiffer springs for grins. Wolff tells you to start with the heaviest spring and work your way back. Run the heaviest spring it will reliably run with. You need the case to stay in the chamber a fraction longer to avoid blowback to your face and eating spent gases. But you still want it kicking the spent cases out at 3-4 O'clock and about six feet.

-Mike
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Old December 30th, 2016, 03:35 PM   #5
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I hate all of you folks running suppressors.



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Old December 30th, 2016, 03:36 PM   #6
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Oh and I hate all of you with threaded barrels even if you don't run a suppressor!



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