Coop de Ville
Member
Just ordered 
What's the slave pin for?
-Coop
What's the slave pin for?
-Coop
sigma spring kit
- Thread starter nick92252
- Start date
RedFalconBill
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So the sear resets.
the slave pin isto remove the trigger pin but hold everything together while doing it. also makes it a lot easier to put that pin back in and keep the new trigger return spring in place. the youtube video for the sd helps a lot.
Coop de Ville
Member
OK Thanks.
Im still amazed at how many just remove whatever springs they wish and call them not needed. Read the patent info, with the cam design of the sear in the Sigma the sear must be pushed both down and back to retract and release the striker. Because of the two directions of travel in the sear all the springs are required.
I have said it over and over again the weight is in the striker not the sear. The striker spring is far heavier than any of the springs in the sear. When you remove the springs in the sear you are still left with the heavy striker spring. Some people seem to think if you have a 1lb spring and a 10lb spring put together you get 11lbs that is not the case.
When two or more springs are used in parallel, the total load is equal to the sum of the loads of the individual springs. The total deflection is the same as the deflection of the individual springs. The total gradient is the sum of the individual gradients.
When two or more springs are assembled in series, the deflection is the sum of the deflections of the individual springs. The load remains the same as the load on the individual springs. The total gradient is the reciprocal of the sum of the reciprocals of the individual springs.
With the Sigma the sear must be pushed against the plastic housing which creates a lot of friction that tied together with the heavy striker gives you that oh so famous Sigma trigger.
You could remove every last spring in the sear and still be left with a heavy trigger pull because of the mechanics of the sear and the striker spring.
With the SDs there is just a simple lever which requires less force to activate the striker, there is also no friction as with the Sigma.
I have said it over and over again the weight is in the striker not the sear. The striker spring is far heavier than any of the springs in the sear. When you remove the springs in the sear you are still left with the heavy striker spring. Some people seem to think if you have a 1lb spring and a 10lb spring put together you get 11lbs that is not the case.
When two or more springs are used in parallel, the total load is equal to the sum of the loads of the individual springs. The total deflection is the same as the deflection of the individual springs. The total gradient is the sum of the individual gradients.
When two or more springs are assembled in series, the deflection is the sum of the deflections of the individual springs. The load remains the same as the load on the individual springs. The total gradient is the reciprocal of the sum of the reciprocals of the individual springs.
With the Sigma the sear must be pushed against the plastic housing which creates a lot of friction that tied together with the heavy striker gives you that oh so famous Sigma trigger.
You could remove every last spring in the sear and still be left with a heavy trigger pull because of the mechanics of the sear and the striker spring.
With the SDs there is just a simple lever which requires less force to activate the striker, there is also no friction as with the Sigma.
Last edited:
flash60601
US Veteran
Well, "We shall see". I just ordered the Apex kit for one of the Sigmas.
I guess everybody has their own opinion, but I must try it on one of them for myself.
I'll "bench/range report" when I get it and install it.
Flash
I guess everybody has their own opinion, but I must try it on one of them for myself.
I'll "bench/range report" when I get it and install it.
Flash
Coop de Ville
Member
Arrived last night. I will try to install it this evening
Coop de Ville
Member
Where can I get another set of spring cups?
That is all.............
That is all.............
Coop de Ville
Member
Nevermind......
Coop de Ville
Member
Installed.....
....Meh.
....Meh.
Erich
Member
Really? Do tell . . .
Coop de Ville
Member
Anyway, Installed fine but I can tell no difference in pull weight. Maybe my trigger was on the light side to begin with, who knows. I never thought it was more than 8 lbs from the factory.
Two things I observed were
1) The striker spring is significantly longer than the original
2) The trigger return has a less positive/ pronounced reset
Not sure what this means til I get some lead down range. We'll see. If nothing else, I have an extra set of springs if needed.
Also, What is the purpose of the lithium grease inside the return spring? Is this necessary for vibration dampening?
Two things I observed were
1) The striker spring is significantly longer than the original
2) The trigger return has a less positive/ pronounced reset
Not sure what this means til I get some lead down range. We'll see. If nothing else, I have an extra set of springs if needed.
Also, What is the purpose of the lithium grease inside the return spring? Is this necessary for vibration dampening?
Erich
Member
Thanks, and I have no idea.
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- Jan 1, 2013
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Trigger pull reduction HELP!
Hey guys I need some serious help with the trigger pull reduction. I have now seen 2.different ways to reduce the pull. I'm confused on which one to do or do I do both. The first one was the apex spring package replacing the striker spring and couple other parts. The other one I have seen is replacing the trigger sear spring. Both have claimed to reduce the pull and not effect reliability. The confusing part is they are in totally 2 different areas of my firearm. Can anyone help? I laugh because I feel if I do both I'm gonna have the smoothest loosest trigger pull, based on what they say! The video for replacing trigger sear spring is on YouTube under S&W sigma trigger sear spring mod sw40ve sw9ve smith & wesson swap fix.
Hey guys I need some serious help with the trigger pull reduction. I have now seen 2.different ways to reduce the pull. I'm confused on which one to do or do I do both. The first one was the apex spring package replacing the striker spring and couple other parts. The other one I have seen is replacing the trigger sear spring. Both have claimed to reduce the pull and not effect reliability. The confusing part is they are in totally 2 different areas of my firearm. Can anyone help? I laugh because I feel if I do both I'm gonna have the smoothest loosest trigger pull, based on what they say! The video for replacing trigger sear spring is on YouTube under S&W sigma trigger sear spring mod sw40ve sw9ve smith & wesson swap fix.
Installed the Apex kit in a 9VE with 1300 rounds through it last night.
As per a Lyman digital trigger gauge, the original pull of the gun when new was 11 pounds, 10.5 oz. Prior to installation of the kit last night, it was the same--and pretty smooth after considerable dry firing and the live firing. After kit installation and some very minor stoning of the striker sear, it came out at 10 pounds, 9 oz. Very hard to tell the difference.
Shot the gun today with S&B 155 gr FMJ; ignition ok. Noted some slight improvement in use, mostly in that trigger felt a bit smoother and quite similar to many S&W revolvers. Don't expect any ignition problems in the future but if so will simply reinstall the original striker spring. Reliability is job #1.
The slave pin is definitely handy.
As per a Lyman digital trigger gauge, the original pull of the gun when new was 11 pounds, 10.5 oz. Prior to installation of the kit last night, it was the same--and pretty smooth after considerable dry firing and the live firing. After kit installation and some very minor stoning of the striker sear, it came out at 10 pounds, 9 oz. Very hard to tell the difference.
Shot the gun today with S&B 155 gr FMJ; ignition ok. Noted some slight improvement in use, mostly in that trigger felt a bit smoother and quite similar to many S&W revolvers. Don't expect any ignition problems in the future but if so will simply reinstall the original striker spring. Reliability is job #1.
The slave pin is definitely handy.
retired_diver
Member
I got tired of the backorder situation with the sigma cups, so I took my G23 apart and tried their cups in my Sigma 9f. They worked so I ordered two sets of Glock spring cups to have a spare. Bought them on Amazon for $3.95 a set each.
gnonyx
Member
The only issue I have with replacing the trigger spring set is these guns has no safety only the trigger. If this is fairly new gun then you are also voiding the warranty.
