DAK Sear Spring substitution affect on P series DA/SA trigger pull - SIG Talk
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DAK Sear Spring substitution affect on P series DA/SA trigger pull

This is a discussion on DAK Sear Spring substitution affect on P series DA/SA trigger pull within the SIG Sauer Gunsmithing forums, part of the SIG Sauer Forum category; I am wondering if anyone could comment on the effect of substituting a DAK sear spring for a sear spring installed into a DA/SA P ...


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Old 01-06-2017, 12:44 PM   #1
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DAK Sear Spring substitution affect on P series DA/SA trigger pull

I am wondering if anyone could comment on the effect of substituting a DAK sear spring for a sear spring installed into a DA/SA P series pistol.

I am wondering if this spring substitution would reduce trigger pull weight and if there are any negatives or positives related to this substitution with respect to reliability.
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Old 01-06-2017, 01:39 PM   #2
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Williamb, welcome to the forum, from the southwest corner of Indiana. I believe you mean the "Mainspring" rather than the sear spring, since the sear spring has negligible effect on pull weight. Your best bet would be to get the appropriate replacement mainspring from Wolff (www.gunsprings.com) in a lighter weight. A 19# spring should lower the double action weight somewhat, factory is in the 22-24# range IIRC, but still be forceful enough to adequately fire most primers. That is one of the hazards to lightening pulls by reducing spring weights.
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Old 01-06-2017, 02:43 PM   #3
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Quote:
Originally Posted by Willard View Post
Williamb, welcome to the forum, from the southwest corner of Indiana. I believe you mean the "Mainspring" rather than the sear spring, since the sear spring has negligible effect on pull weight. Your best bet would be to get the appropriate replacement mainspring from Wolff (www.gunsprings.com) in a lighter weight. A 19# spring should lower the double action weight somewhat, factory is in the 22-24# range IIRC, but still be forceful enough to adequately fire most primers. That is one of the hazards to lightening pulls by reducing spring weights.
No I am referring to the sear spring. I recently viewed a video by Steve Jenkins whereby he sent his pistol to SIG for an action enhancement job. When he received it back he evaluated the work and commented that they substituted the DA/SA sear spring for one meant to go into a DAK pistol. I think he implied that it wasn't reliable. Here is the link if you are interested.

I was trying to more fully understand the implications of this substitution.

Last edited by Williamb; 01-06-2017 at 02:52 PM.
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Old 01-06-2017, 03:32 PM   #4
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Williamb, thanks for the post, since I had never watched it. Once again, I have no idea why the DAK sear spring was substituted, as it's sole purpose is to keep the sear in contact with the hammer. Just as Steve had wondered why other things were done, that serve no viable purpose. I'm no engineer, but I was a certified Armorer for Sig, 20 years ago. Of course armorers are there to troubleshoot and repair a firearm, not make modifications. But the point, is I understand how these parts work together.
Without actually knowing the specifications of the DAK spring in relation to the DA/SA unit, it would be hard to say what effect it would have. If it was too light, it could theoretically "bounce" in single action rapid fire, allowing the pistol to possibly double, if certain conditions occurred.

It could possibly effect the single action pull weight, but that should be accomplished by polishing and angles, not spring weight for the reason mentioned.

Last edited by Willard; 01-06-2017 at 03:39 PM.
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Old 01-06-2017, 04:22 PM   #5
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Grayguns (GGI) does sell a spring set that includes a "competition" sear spring:



Wolff Gunsprings sells GGI most of their springs, I don't know if the lighter sear spring is sourced from Wolff (though I'd bet it is) - it's not listed on Wolff's site but you could call and ask.

Note that slightly bending down the spring leg that goes under retaining pin will accomplish the same thing - weakening the sear spring a little. When or if you do this, or even if you choose not to, it's a good idea to stone and polish the lower end of the spring that bears against the sear, as the sear moves, there's a small amount of movement between these surfaces, so the stock sharp edge on the spring wire is a no-no.

If your goal is to lower SA pull, then reducing the sear's positive engagement angle (more towards neutral) will have a much more pronounced effect. To "see" why, slowly pull the trigger in SA while watching the hammer from the side (to get the movement slow enough to watch, it may help to apply a little back pressure on the hammer). If, just before the sear releases, the hammer moves back a tiny bit and then drops, that little bit of rearward motion is caused by the positive sear angle "camming" the hammer back. To do this the sear must further compress the hammer spring - - and therein is the reason for much of the heavy SA pull.

I would not attempt adjusting the sear angle without the proper tools and jigs , as well as gunsmithing knowledge. But done properly, a DA/SA SIG can easily have a competition trigger in the 2 - 3 lb range. Tweaking the sear spring, as above, will net you a few ounces of change. Willard said, "negligible", I'd say maybe close to that but much of the many things done in an action job, taken by themselves, would be negligible . . . it's the cumulative effect that puts the smile on your face .

Note too, the when doing this kind of action work, I consider it important to do a simulated drop test, I use a rubber mallet to bonk the cocked gun (wrapped in a rag to avoid marks) to make sure the sear does not release from impact.
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Old 01-06-2017, 04:33 PM   #6
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DAK springs are of greater tension than da/sa springs. Many are of the opinion that a DAK sear spring will reset the single action faster on a da/sa pistol. I've tried and, honestly, can't feel the difference.
Also, after watching that video I have to question why you'd send your pistol off, spend a fair amount of money for work and then question virtually everything the gunsmith did to it.
It was also very obvious that the maker of that video doesn't know nearly as much about SIG Sauer pistols as he thinks he does.

Last edited by P229R; 01-06-2017 at 04:41 PM.
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Old 01-06-2017, 05:23 PM   #7
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Thanks for all the responses. I really appreciate all the insights you provided. I was not able to figure out the point the YouTube poster was trying to make. All of your comments were much clearer and to the point.
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Old 01-06-2017, 05:46 PM   #8
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welcome from az
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Old 01-06-2017, 06:13 PM   #9
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Ferrari Steve does reasonably good videos, normally. This one had some questionable stuff in it. I left a longish comment addressing some of his statements.
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Old 01-07-2017, 02:05 PM   #10
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I'm tempted to pull the slide on my 229 and compare the SA trigger pull with my sear spring anchored and un-anchored.

I'll be very surprised if I can feel a difference. But then I have some pretty "stupid" hands when it comes to stuff like that.
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Old 01-07-2017, 02:13 PM   #11
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A stronger sear spring might make the SA pull heavier. It might be preferable to some people if the trigger pull SA was closer to DA... Just a thought
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