I recommend anybody with a Sigma do this. The frequent complaint you hear is a heavy trigger. I did not have a problem with the trigger before but now it feels substantially lighter and smoother. We'll see if my groupings improve this week at the range.

Follow these steps, thanks to @GunSmithUSA

Sigma Trigger Fix / Mod DIY walk through for beginners EASY - YouTube

It made a nice difference in my 9ve.

These threads kill me the weight you feel is the striker not the trigger. Simple test take the slide off and pull the trigger notice the weight. Put slide on and rack it pull the trigger and notice how the weight is greater. You could remove every last spring in the sear and still be left with a heavy feel because its the striker spring you are feeling

That's not true whatsoever. There is 1 super stiff spring that you do not need. Then there is and outer spring that you can do without. These 3 springs put together determine the lbs. of pressure on your trigger finger.

Actually it's both. The striker is 4.5# combine that with 7#'s worth of other springs in the gun. You get the 11-12#'s of trigger pull. As everyone here knows if you remove the pigtail and outer spring you get 6-7# trigger pull bottom line.

come on now you dont add say a 4lb spring to a 10lb spring and end up with 14lbs total logic and physics disallow that. Guys it is a DA recoil dependent gun the striker must be pulled back by the action of the trigger. You can argue all you want but facts are facts the weight of the sear springs is less than the weight of striker.

The springs were added after the law suit because the gun was basically a Glock but priced right. With a Glock there is no felt weight with take up also follow up shots are very fast with the Glock as the reset is short.

S&W had to make changes to create a different trigger action which is why you have all those springs. With the Sigma you feel the weight of the trigger on your take up and you also have a very long reset. The reason the Sigma feels so heavy compared to the glock is the weight felt with take up and the difference in the action of the slide on the striker. It also feel gritty and creeps an insane amount because the sear is pushed against the plastic sear housing. Plastic against metal just doesn't give you a crisp trigger.

With the Glock the striker is pulled back by the action of the slide in a sense half cocking the striker. When the trigger is pulled the striker is only pulled back a little before it breaks. With the Sigma the sear is only reset by the action of the slide the trigger must fully cock the striker before it breaks which is why you feel more weight with the Sigma.


But by all means feel free to remove what ever parts you deem to be extra just dont complain when teh trigger doesn't reset. Or you start getting light strikes. If you want a match grade trigger throw down $3000 on a tuned race gun like a Wilson Combat.

What? Took that way out in left field, didn't ya? The OP was just commenting on doing the same old trigger mod on a Sigma. I don't think he was looking for a history, or physics lesson. Much less negative feedback from someone that's tired of trigger mod threads.

Don't get all technical about it. The bottom line is if you perform this trigger mod you get a lighter, smoother trigger. Period.

Ok! I'll entertain this.

I'm not a fan of Wolff striker springs. So, if you remove the pigtail and outer spring from the sear block. You pull the trigger and now it takes less effort. WHAT DO YOU CALL IT? It's obviously not a lighter trigger, so what is it?

As I said remove every last spring in the sear and you will still be left with a heavy trigger as the striker is a heavier spring than any of the sear springs. So removing any springs in the trigger will not lighten the actually trigger pull. Although you might feel a slight difference in take up but that is it. It is simple as I said remove slide pull trigger put slide on rack it pull trigger....it was harder with the slide on because of the striker spring.

I've seen the video. I'm familiar with the lawsuit. I've heard both sides of this argument in a much more civil tone than this thread has taken.

Proponents of this modification say it's a lot better trigger, "better" being defined as a lot lighter. The video "says" there has been no light strikes since doing the mod IF it's done right.

Arguments against the modification say that if S&W wanted those springs gone, they wouldn't be there. Those same folks also are used to the trigger pull on their Sigma's as it's comparable to a double action revolver. They also say that you can take the trigger assembly apart using the same video and polish all the rough edges and such. That alone will give you a very nice trigger pull although it will still be heavier, heavier being defined as about 12 pounds, same as on a double action revolver.

You also see folks that do a combination of things, as is also reported in the video and in various forum threads. Some will just take out the "pigtail" spring and do the polish job on the rest of the assembly. This results in about a reported 10 pound trigger pull.

The Sigma has no safety other than its "heavy" double action trigger. Lightening it to 6-7 pounds I doubt is recommended by anyone who is going to use it as a home defense weapon as in a high stress situation accidents happen. They happen a lot easier when you just modified your pistol to have a trigger pull that is half of what the factory intended. Have fun explaining an accidental death to the district attorney with such a modification. I know I'd feel guilty as all heck if I had an accident with a weapon I had modified to such a degree.

Let's keep things friendly no matter what you decide to do or not to do with your weapon.

Do the research on your own, find out what I did. Should your Sigma have a "gritty" trigger as well as extra long take-up contact S&W and see what they recommend if you're not comfortable polishing the inner components of the trigger mechanism. S&W's customer service/warranty is top notch and I'm sure you'll get a resolution to your issue. S&W, however, will NOT do a trigger job just because you think the pull is too heavy.

__________________
Live For Today Not Tomorrow

I wasn't gonna step in here, but I gotta.
I don't disagree that some of the weight in the sigmas trigger pull is from the striker being pulled rearward as you pull the trigger, maybe even most of it, but the sear assembly definately carries some of that weight also....60% striker, 40% wear assembly? Who knows but saying that the weight you feel is just the striker is silly, rabbit.
Now the sigma is a true DA, as in its not precocked as the m&p, and glock. As you stated the sigma must fully pull the striker rearward and lower itself to release. so how would the energy needed to not only move the striker rearward, but also lower the sear against the springs not be felt?
So yes you can remove everything from the sear and still have a heavy trigger, BUT not near as heavy as before.
I don't recommend taking anything but the pigtail spring out and some good polishing, but hey its not my gun....but if this is done a much better, and lighter trigger is achievable, and still be heavy enough to be safe as S&W intended.
Sorry lol.

Here's that "Special" Sigma /SD Forum doing what it does so well again. Like Groundhog Day-over and over and over. Some really mature answers and comments really fit in well on a gun forum.

__________________
KMAG YOYO

I think everyone here, even the gawgah boy, understand that if we do the mods to our sear we will be left with a fairly stiff trigger pull, BUT trust me, its night and day better with the piggy tail gone and a good polishing.
And a lighter pull overall, even pulling against that pesky, heavy striker spring...
Psssst physics......

I removed the torsion (pigtail) spring on my Sigma 9 and the trigger's lot better. Slightly lighter but smoother.

__________________
_It was love at first shot_

I removed the pigtail spring on my sigma .40, and I can tell a little difference. I shot it yesterday with no malfunctions or problems. Overall, happy with the modification.

__________________
Dan

I sprinkled "pixy dust" on my Sigma and now it can fly!

__________________
Dem's fightin' words wabbit!!!

Good one....

__________________
Dan

Ryan1904, Please Note---I did a cleanup-polish-spring mod on my Sigma 9ve two years ago and have never had a malfunction other than my nephew getting a stovepipe once due to limp wristing. It shoots any ammo I have tried and is one of my favorite range guns. That said, I would strongly recommend that you watch all 5 of Jeff's Videos at least once if not two or three times before attempting any mod to your Sigma. Sigma 9mm, Part 1, Turning a pigs ear into a silk purse - YouTube
He goes into great detail on the inner workings of the gun and what causes the gritty feel of the trigger and how to clean it up without compromising performance. Using his method I dropped my trigger pull from just under 12# to 7 1/2# with a very smooth pull and crisp break, and much improved accuracy and comfort.

will the original 1994 trigger assembley fit and work in a new sigma

I actually put all the springs back in. Like I said I have never had a problem with it. My groupings were better with the stock trigger. I guess I got used to it.

I decided to try the mod on my Sigma40VE. if there might be a problem without the outer spring, I have one that is much lighter than the stock spring. it will contain the inner spring just fine. I made sure to put the factory springs in a good place if needed later.
still a long pull yet smooth and with less effort. the reset is positive. over all I like it.

Ron

Am I the only person who had a problem removing the pigtail. My 40ve stopped resetting 100% of the time. I had not removed any other spring and didn't notice much difference anyway. I put that bugger back in, and it's not easy to do it right. No more problems. I now have a brass outer spring from U Plumb-it that works great. Now 7-8#s.

__________________
Hold on. SWAT's at my door.

So all you've done to your sigma is replace the stock outer spring with a brass one? No other sear or trigger mods? No polishing, nothing?
Hard to believe replacing the outer spring alone got the pull to 7-8#.....

Be sure to keep the springs you take out. If you have to send it back in for warranty work, they have to be there.

Mine are in a safe place.

__________________
USN WWII Korea
NRA