apex fss spring combinations and pull weight possibilities??? - MP-Pistol Forum

apex fss spring combinations and pull weight possibilities???

This is a discussion on apex fss spring combinations and pull weight possibilities??? within the MP Talk forums, part of the Smith & Wesson MP Forum category; i just bought a used m&p pro with an apex fss installed. it came with all the factory parts that came out of the gun ...


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Old October 7th, 2012, 07:16 AM   #1
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apex fss spring combinations and pull weight possibilities???

i just bought a used m&p pro with an apex fss installed. it came with all the factory parts that came out of the gun during the fss apex kit instillation. i put the factory trigger spring back in (this is supposed to lighten the pull a bit over apex's heavier trigger return spring that comes with the fss trigger kit) and cant really tell any difference in the trigger pull between the factory or apex trigger spring. if i wanted to lighten the pull of the fss trigger even more....... would simply dropping an apex competition trigger return spring be a viable option? has any one ran this set up?
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Old October 7th, 2012, 07:23 AM   #2
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It should, but if you didn't notice a huge difference from the APEX AEK trigger return spring it's doubtfull you'll see the smaller diffference the APEX Comp spring makes.
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Old October 7th, 2012, 08:45 AM   #3
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Originally Posted by KRWeiss View Post
It should, but if you didn't notice a huge difference from the APEX AEK trigger return spring it's doubtfull you'll see the smaller diffference the APEX Comp spring makes.
But there is nothing wrong with using the competition trigger spring correct? The lighter trigger springs don't effect reliability in any way do they?
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Old October 7th, 2012, 02:11 PM   #4
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Sometimes the trigger safety will catch a little with the Comp TRS, making it feel like there's a hitch in the trigger pull. A modification can be made to account for this, but it's more work.

Also, the lighter the trigger return spring, the more pronounced everything else feels. With the APEX AEK TRS you don't feel the striker block or sear nearly as much as you feel them with the APEX Comp TRS. So the lighter the TRS, the greater the perceived stacking effect.

P.S. I don't want anyone to conclude that installing competition parts in a carry/self-defense gun is a good idea. That is a really BAD idea. If that's what you're considering, PLEASE don't do it.

Last edited by KRWeiss; October 7th, 2012 at 02:20 PM.
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Old October 14th, 2013, 08:04 PM   #5
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Bringing this Thread alive...

What would be the trigger safety fix ?



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Old October 14th, 2013, 08:46 PM   #6
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What are you using the pistol for? Competition, carry, or just plinking.
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Old October 15th, 2013, 06:01 PM   #7
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In my case IDPA / IPSC competitions

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Old November 25th, 2013, 12:12 PM   #8
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From Apex Tactical

This is what Jon Shadwick at Apex told me about modifying the trigger on the M&P. Very good information.

Option #1
Order the FSS.
Install your Stock Trigger Return Spring with all the FSS Kit parts.
That should yield a 3-3.5lb trigger pull without modifications or extra costs.

Option #2
Install the complete FSS Kit with the following exceptions.
Use the Trigger Return Spring from the Comp Kit.
Use the Striker Spring from the Comp Kit.
Start off with the FSS Sear Spring, so we negate the potential for Sear Flutter.
This should yield a 2-2.5lb pull with approx a 0.25" trigger stroke.
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Old December 22nd, 2013, 07:09 AM   #9
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Cool

This is what I have found for Ma guns putting a APEX Kit into them, I would think that the numbers will be different for you Free Staters with the 6.5 Lb trigger pull, this may still help you...


.
OK I have just got done doing my M&P Shield with a APEX Kit and my M&P 45 with a APEX Kit, here's what I have:


I checked my trigger pull on my Shield and it was at 11.5 Lbs (Ma gun).

After I installed everything but the trigger spring I rechecked it, I was down to 7.5 Lb's...

I had heard of the pull being different if you didn't install the trigger spring, I thought it was the other way around than what it turned out to be...

I took it apart again and added the APEX trigger spring, I than put everything back together and rechecked the trigger poundage.

I am down to 6.5 Lbs now...


So the APEX will give a Mass gun a 6.5 Lb trigger and it feels real good... It's not gritty, it pulls reel smooth, in short I like it...

I would think that once I get out and shoot it some the trigger poundage will come down some more...


.

OK just got done doing my (Ma) M&P 45...

Stock Trigger... 10 Lbs

APEX Kit with stock M&P trigger spring... 6.5 Lbs

APEX Kit with APEX trigger spring... 5.25 Lbs

Very nice feel to that one also...


.

Just thought that you folks that were thinking of doing a APEX Kit would like to know what you get, or at least what I got so you can decide to do a APEX Kit or a Gun Smith Trigger Job...

I'm not trying to take any work away from a gun smith, I love the work that Greg Derr has done for me... I just hated the all day drive to him and than home, so I wanted to try and do a few APEX trigger jobs myself... It wasn't that hard to do either...

Good Luck on yours...


Here's my full Thread that I did on it:

APEX Kits, what I have found...


.
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Old January 19th, 2014, 09:06 AM   #10
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Installing the Apex FSS and using your stock trigger spring will net you a 4-4.5 lb trigger. If you're doing trigger work on your pistols do yourself a favor and buy a trigger pull weight gauge and eliminate the guess work.

Lyman-Electronic-Digital-Trigger-Gauge



-Mike





Last edited by Hamfisted; January 23rd, 2014 at 05:51 AM.
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Old January 22nd, 2014, 07:53 AM   #11
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So I ordered JUST the AEK trigger for mine for now.. And was curious what it did for pull weight so I emailed Apex. This was my response from John S.
"Due to the 20% increase in mechanical advantage over the Stock Trigger Design, the AEK trigger may shave 1lb off of your overall trigger weight.
To counteract this, you can use the Sear Spring provided with the AEK Trigger to maintain your Trigger Weight."

Just installed last night. Going to shoot this afternoon. Dry fire wasn't a huge difference in pull weight but love the travel reductions. Can only imagine what you FSS guys triggers are like! I'll step up to the rest of the dcaek kit soon..
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Old May 12th, 2016, 05:23 AM   #12
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Quote:
Originally Posted by KRWeiss View Post
Sometimes the trigger safety will catch a little with the Comp TRS, making it feel like there's a hitch in the trigger pull. A modification can be made to account for this, but it's more work.
I installed the trigger return spring along with the competition AEK and it is catching bad enough that the trigger gets stuck and will not return forward. What is the modification you were referring to? thanks
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Old May 12th, 2016, 10:49 PM   #13
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The trigger not returning is a different problem. Unless something is out of spec (rubbing or binding), the only fix I know of is to use a heavier spring.
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Old May 21st, 2016, 08:23 AM   #14
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When I installed the Apex forward set sear and aluminum trigger kit in my M&P pro series 40L the trigger pull was consistently at 4.25 pounds.

Using the factory trigger return spring with the Apex FSS kit, and with final adjustment of the trigger bar loop I have achieved a 2.5 pound trigger pull.

It seems odd that you don't notice a difference between the two. However, I would say that the Apex comp kit spring would lower the pull as it is lighter than the FSS kit spring or the factory one.
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