I know that wolff makes a lighter striker spring that 50% say use and 50% say dont use but they also have a replacement trigger return spring that lowers the factory 4lb to a 2.5 lb trigger return spring so I was wanting to see if anyone has tried it and if so did it help trigger pull.

I have used them from wilson and wolf with no problems, although the main springs you should use caution as they can cause light strike problems..

I have one(trigger spring) on order and will post my results.

I want to test it by rapid firing cheap ammo. Then I will rapid fire some hot ammo, to test the reset with the new spring. I have not heard of any problems yet, and the springs have been out there for some time.

Just a caveat. I have polished and replaced springs in my sear assembly, as well as replaced the striker with a Glock 4lb striker spring. My trigger pull is smooth and I have yet to have a malfunction. That said, I do not recommend these changes for anyone that depends on this weapon for self defense or duty. I have not run a thousand or two rounds through it yet to prove the modifications. I am doing these changes ONLY for the purpose of plinking at our home range. I am competing with my son-in-law's Glock 17, and his modifications. I do NOT want a single action sigma and am only attempting to smooth and lessen the trigger pull for purposes of accuracy. I still have the handicap of deteriorating eyesight, and less steady aim associated with my age and coffee use. I have kept all removed parts so that I can eventually restore the pistol to stock.

The best thing I have done to my Sigma has been to polish the parts and the use of S&W Dry Lube. My pistol is one of the smoothest action pistols I have ever used.

I have also ordered a Hi-Viz front sight via Amazon for less than $30 shipped.

The Sigma is probably one of the best bargains out there for a self defense pistol. Like any other weapon, caution should be used when making any radical changes to it's operation. I am an amateur, not an expert. I am retired and until summer arrives I have time to tinker, so I am tinkering with the Sigma.

The comment was made regarding replacing the trigger spring. Like I said, I plan to do just that in the next week or so. I have heard no posts or comments regarding incidents of failure, so I am going to assume that perhaps anyone that has had failures, is either too embarrassed to admit they failed, OR the changes have not been proven to fail yet. I will post my results when and if I do have failure. That's how we learn.

And remember the posts from our "purist" friends on here:
"The Sigma operates just the way S&W intended it to operate. If you don't like the hard trigger pull, then buy a different gun." "The hard trigger pull will make you a better marksman."

And remember MY comment: Anything man-made can be improved upon. An example: Shelby took a Mustang and made a race car out of a economical vehicle designed for girls.

who makes the lighter trigger return spring and does anyone have a part number. my return spring is lighter but its because i stretched it and cut it, i have over 700 rounds run with this mod and zero malfunctions. i do not recommend the striker spring for sd use i averaged about 1 light strike per mag so i removed it.

I own six of 'em and never found a need to modify the trigger on any of them.

Yes, the triggers are heavy but you will get used to it after 1,000 rounds (if it is the only weapon you shoot over 4 or 5 range trips). It will make you a better shooter as well by teaching trigger control. Many new shooters to the Sigma will pull left and low (for right handed shooters). It isn't the gun - it is the shooter. The heavy trigger was made to help prevent accidental discharges.

Finally, modifying/swapping the springs can lead to light primer strikes. It is fine for a range toy, but not acceptable for a SD weapon. If you want something with a lighter trigger, go for the SD, M&P, or even a Glock.

Exactly! Nothing helps the sigma trigger pull more than pulling the trigger does.

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SD9VE, American perfection!

Let's see. "..you will get used to it, after a 1000 rounds.

"swapping the springs can lead to light primer strikes"

So, you are saying that if I replace the "trigger spring" it could lead to light primer strikes? How's that? I could see how it could lead to reset problems, but light strikes? I am not an expert, so if you have a minute, could you please explain? I thought only the striker spring would influence the amount of force that the firing pin is forced against the primer. Did I get that wrong?

Does that mean that by pulling the trigger, you are eventually wearing the action smooth and it gets better? Does it also mean that by pulling the trigger that eventually the spring gets weaker, making it easier?

That seems to be the opposite of what the other commenter was saying that "you will get used to it."

I agree with both of you. But, I decided not to wait. I polished my roughly machined surfaces and I doubt that that will cause a light strike. Changing the springs may, but unless I am wrong, I doubt changing the trigger spring will cause a light strike. I may be wrong. I have been wrong on more than one occasion.

Jmike,

I agree with the posters above regarding modification to a self defense weapon. You should be very cautious.

I don't own six of them, so I am not an expert. I do own other weapons, and have owned other weapons for over 50 years.

Another point to consider. You don't need sights for self defense either. I doubt you will chase someone down the street shooting at them. With self defense, all you need is to draw, point and shoot. Most self defense shooting will be within 15 feet. You won't need any fancy sights.

I'll let you know how my trigger spring mod works out. If you are still considering the change, there are several places on line to purchase trigger springs. Just go to a few parts suppliers and look around. Wolf also produces springs for guns. I don't need to tell you to be careful.

I have purchased a few new and used S&Ws this past year.

I have put the Wolff spring kits in most of them. I also have stoned and polished the return slide and a few places on the trigger and hammer pieces. I have the Kuhnhausen manual, two very nice Arkansas stones and an assortment of wet/dry sandpaper. I also have the rebound spring removal tool, looks like a bent screwdriver with a slotted end. I have some gunsmith grade screw drivers.

I got all my tools for fooling around with 1911s.

The reduced power Wolff mainspring has only been effective in my 25 Classic. All other guns resulted in light primer strikes. The full power Wolff main spring is wonderful.

The 14 pound rebound spring has been the lightest that I can use. The 13 pound is longer and more squiggly, and I can't get it installed. Launched a few around the shop. The 12 pound doesn't give me positive reset.

The most recent gun I've worked on is a nib 617. The D/A trigger went from way too stiff to very enjoyable, in about an hour. 0$ spent on ammunition. 0 time spent on that first 10,000 rounds to get it "worked in".

I had my 25 Classic at the range a month or so ago. Shooting steel plates on the pistol end of the rifle range. Shooting clay birds on the birm in back of the 50 yard line. One of the other members wanted to try my gun. He shot a cylinder in D/A, then another. He said my D/A revolver had a lighter trigger than his Springield Armory 1911. I haven't got a trigger pull gauge.

I also like the Ahrends retro combat grips.


25 Classic

That's a beautiful weapon, sir.

You can get the trigger springs here: Springs for SMITH & WESSON NUMBERED SERIES Semi-Auto Pistols

Pack of 2.5lb,3.0lb,and3.5lb trigger return springs #26125

Part Numbers for 2.5 lb trigger retun spring
Pack of 1#26181 Pack of 3 #26185 Pack of 10 #26126

Part Numbers for 3.0 lb trigger return spring
Pack of 1#26182 Pack of 3 #26186 Pack of 10 #26127

Part Numbers for 3.5 lb trigger return spring
Pack of 1#26183 Pack of 3 #26187 Pack of 10 #26128

I agree! My Sigma is stock. 1700 rounds and going strong. Just shoot it. Trigger lightens up.

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Sigma 9mm/XD 9

Here is a Tip only a few have caught on to since I posted it way back. And it Will Not make you Sigma One Iota Less Reliable and your Trigger Pull will lose some weight.

You have to be capable of disassemby of your slide and putting it back together properly!

The Firing Pin Safety Button is Way Over Sprung so if you take it out and the spring. Now in the six of so SV's I've done there I've found Factory Crud in there Clean It Out Well.

Polish your Firing Pin Safety Button and find a lighter replacement spring. Brownell's has Spring Stock check them out on the web. Go the same lenght in a replacement spring just lighter stock as in the Pics below. Only use a drop of your favorite lube on your finger to lube the button during reassembly.

Now to the Trigger Return Spring. ALL of the Sigmas I have done had a Piece Of Felt inserted into the Trigger Return Spring. Why You Ask? It makes the spring Harder to stretch. As the spring is drawn it constricts on the Felt Piece the result being a Harder Stretch=More Force Required to pull the trigger. "Get Rid Of The Felt Piece!"

If you are not Gun Handy maybe this won't be for you but to my Friend Shadetrees (;-) give it a try. Mikie Likes It!

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John McCaw
FFL/SOT2

I didn't say trigger spring. I personally would not replace springs on a SD/HD weapon and have not. Range toy, sure, maybe...

My mistake. I thought you were referring to the originator's question regarding replacing the trigger spring. My apologies.