Sigma trigger work (pictures)

[Mike Boyd]

There is another post here:
http://smith-wessonforum.com/eve/forums?a=tpc&f=5201039...961052282#8961052282
That link will cover most of what the pictures show here. The pictures really help to understand what is contained in that link.

To give you the short version, I will cover what I did to mine. Your results may vary.

There are 2 sear springs-a smaller diameter inner spring, and a larger diameter outter spring that contains the smaller spring. I REMOVED THE LARGER SPRING ENTIRELY.

The small spring that is wrapped around the lower sear spring- I REMOVED THAT SPRING ENTIRELY.

I replaced the striker spring (inside the slide) with the Wolff Reduced power striker spring Midway part #295637.

I polished the sear where it touches the plastic sear ramp, the striker head, and sides of the sear where it touches the sear bracket, and the sear slot where the pin rides/pushes on the sear.

Doing these things has SIGNIFICANTLY altered the trigger pull. It is MUCH easier to pull the trigger. I would **GUESS** the pull to be in the 4-5# range. Polishing the sear made the pull much smoother and quite predictable. It is a different gun! Night & day difference.

I have experienced 1 FTF out of 150 rounds. Again, your results may vary.

You were so lucky. I tried your fix with only the small spring and I fired two of the easiest and most accurate rounds ever, then the trigger failed to reset. When I disassembled the spring was still in place, so evidently my Sigma trigger needs some extra umph, so I installed a much lighter and slightly cut down outer spring from a pen. The pull is still nearly as light as only one spring, now off to the range to shoot 50-100 rounds of .40 ammo through it, to see if it is more reliable.

Have to admit, that really light pull with only one spring was very nice, even better than most Glocks, and much more accurate, two rounds only an inch apart at thiry feet, both in the center!!!

Let's hope this fix works reliably!!!

Back from the range and a little over 50 rounds with no issues using the modified pen spring over the original small trigger spring. Pull is about 5#+, much smoother and it has gone "Bang" every time the trigger is pulled and this is with the cheap WWB, BB, and Federal ammo. I think this may become my primary CC gun, due to the light weight and 14 round .40 mag. I will fire another 100 or so rounds through it and if it continues to be as reliable and now as easy to shoot accurately, It will definitely be a keeper.

For those of you that have the Sigma 9, how is the trigger configured, does it also have three springs?? The manual doesn't have a breakdown, thanks.

 

[ps_outrage]

im using the same method as the above poster, removed pigtail, and removed the outer spring, then used and cut a pen spring, left the pen spring just a little longer then the original outer spring since the pen spring is alot much softer, ive shot over 1000+ rounds and not one misfire, and the reset works every time. No problems what so ever. I was ready to get a glock 23 before I give the sigma one more attempt, i couldn't be any more happier with my sigma 40.
Straight forward thanks to the ones who provided the information I needed to keep my sigma

Btw: just my opinion, I think sigma is the hottest looking firearm on the market, plus looks even tougher with a streamlight tlr-1s, ill probably invest in a tlr-2 soon