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Trigger Job on a P938

This is a discussion on Trigger Job on a P938 within the SIG Sauer Pistols forums, part of the SIG Sauer Forum category; Have any of the owners of the P938 had a trigger job done. If so, how much did you reduce the factory pull of 7.5 ...


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Old 10-17-2012, 03:20 PM   #1
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Trigger Job on a P938

Have any of the owners of the P938 had a trigger job done. If so, how much did you reduce the factory pull of 7.5 to 8.5 pounds. I am looking to get to a 5 pound pull if possible. I did call Sig Customer Service today to ask why they do not offer this service and they said they have not worked out a price yet for the P938. They also said there is no reason why a qualified gunsmith could not do a good job of reducing the trigger pull as long as they don't replace any Sig parts. That would void the warranty.
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Old 10-17-2012, 07:25 PM   #2
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I did my own trigger job on my new 938. New, unfired the trigger was measured at 8.2 lbs on average and was gritty.
As I started using my 938 at the range to break it in the trigger did get less gritty and a better feel. But after 500 rounds it was still measuring in the high 7s and low 8s. I read many posts on other forums where other 938 owners were having similar trigger issues so I decided to do what I often do with my guns........I like to tinker with them, so here goes

OK,

No gunsmith was harmed or paid in this exercise

Trigger Pull: Brand new, unfired: 8.2lbs
Trigger felt gritty and long, makes clunking noises on reset.

Changes made to reach this point in the order done:

Cleaned the frame and all parts with brake clean to remove all oil products. (NC)
Applied Frog Lube to the entire frame and all internal parts (NC)
Polished all contact points in the hammer and sear (NC)
Polished the entire trigger bow (NC)

-----At this point the pull was averaging about 7.2 lbs--------------

Replaced the plastic trigger with a custom SS trigger ($40.00)
Slightly changed the pull of the sear spring leaf (NC)
Replaced the main spring with a Wolff Reduced Power 20lb spring for a Colt Mustang ($4.19)
http://www.midwayusa.com/product/376...-reduced-power

------At this point the pull was averaging about 4.3 lbs---------------

I suspect the greatest change was from the changing of the mainspring

Have shot over 600 rounds of 115gr FMJ since purchased

No recommendation is made about what you should do with your gun

No warranty or promise is made about what similar changes to your gun may result in.

Jim


Last edited by jrprich; 10-18-2012 at 05:38 AM.
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Old 10-17-2012, 08:41 PM   #3
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Can you share any guidance on how to do the following:

Polished all contact points in the hammer and sear (NC)
Polished the entire trigger bow (NC)


Much appreciated
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Old 10-17-2012, 09:21 PM   #4
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Quote:
Originally Posted by jontykay View Post
Can you share any guidance on how to do the following:
Polished all contact points in the hammer and sear (NC)
Polished the entire trigger bow (NC)
Much appreciated
Sure, but I am not a GS so take my comments with that in mind

Also know that any such work could void your warranty

There are many how tos on youtube

Polished all contact points in the hammer and sear: I do this with a fine stone with a bit of light oil. I try to make sure no metal is removed and that I keep the stone square to the part. The goal is to get the contact points mirror smooth to reduce friction

Polished the entire trigger bow: Removed the trigger and then the trigger bow (bar) from the trigger. I used 600-1200 grit wet & dry paper to polish the entire bow and remove any rough areas along the edges. I then polished it to a mirror shine on my buffing wheel.

Again, you have to be careful because if you change the contact angles or depth on the hammer or the sear you can ruin both parts and on a 938 that will cost you well over $100 in replacement parts IF you can even find the parts.
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Old 10-18-2012, 07:09 AM   #5
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Quote:
Originally Posted by jrprich View Post
I did my own trigger job on my new 938. New, unfired the trigger was measured at 8.2 lbs on average and was gritty.
As I started using my 938 at the range to break it in the trigger did get less gritty and a better feel. But after 500 rounds it was still measuring in the high 7s and low 8s. I read many posts on other forums where other 938 owners were having similar trigger issues so I decided to do what I often do with my guns........I like to tinker with them, so here goes

OK,

No gunsmith was harmed or paid in this exercise

Trigger Pull: Brand new, unfired: 8.2lbs
Trigger felt gritty and long, makes clunking noises on reset.

Changes made to reach this point in the order done:

Cleaned the frame and all parts with brake clean to remove all oil products. (NC)
Applied Frog Lube to the entire frame and all internal parts (NC)
Polished all contact points in the hammer and sear (NC)
Polished the entire trigger bow (NC)

-----At this point the pull was averaging about 7.2 lbs--------------

Replaced the plastic trigger with a custom SS trigger ($40.00)
Slightly changed the pull of the sear spring leaf (NC)
Replaced the main spring with a Wolff Reduced Power 20lb spring for a Colt Mustang ($4.19)
http://www.midwayusa.com/product/376...-reduced-power

------At this point the pull was averaging about 4.3 lbs---------------

I suspect the greatest change was from the changing of the mainspring

Have shot over 600 rounds of 115gr FMJ since purchased

No recommendation is made about what you should do with your gun

No warranty or promise is made about what similar changes to your gun may result in.

Jim

great explanation of what you did.
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Old 10-18-2012, 07:16 AM   #6
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Thanks. That helps a lot.
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Old 10-18-2012, 07:24 AM   #7
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Thanks for the positive comments !

If anyone is interested in a high quality CNC Stainless Steel triggers for the P238 or P938 you should contact Glen at partsproduction@oregoncoast.com
He has these in bare stainless as well as black ones.
No relation to me, just a nice guy with a quality product.

Jim


Last edited by jrprich; 10-18-2012 at 07:27 AM.
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Old 10-18-2012, 08:46 AM   #8
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Good to know the partsproduction triggers work. I installed one of these on my 238.

Did you have trouble removing the trigger pin? On my 238 it was a bear to knock out. If I recall, these are machine pressed.
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Old 10-18-2012, 11:02 AM   #9
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is the trigger the same part as the 238? or is there a difference? i'm curious how much of the parts are interchangeable
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Old 10-18-2012, 01:53 PM   #10
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Quote:
Originally Posted by Vetteguy904 View Post
is the trigger the same part as the 238? or is there a difference? i'm curious how much of the parts are interchangeable
As far as I could tell the triggers are identical. The SS 238 trigger installed with no modifications required.

I no longer have my 238 so I can't tell

Last edited by jrprich; 10-18-2012 at 01:56 PM.
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Old 10-18-2012, 01:54 PM   #11
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Quote:
Originally Posted by rpolansky View Post
Good to know the partsproduction triggers work. I installed one of these on my 238.

Did you have trouble removing the trigger pin? On my 238 it was a bear to knock out. If I recall, these are machine pressed.
It took a couple of HARD hits with a full size hammer using a nail set as PP suggested. It went back in hard as well.
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Old 10-18-2012, 02:33 PM   #12
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Stopped by to see my gunsmith today and had him measure the trigger pull on my P938. It broke at 8 pounds. Sig states that the factory pull is between 7.5 and 8.5 pounds so I am right in the middle. I decided to go ahead and have the trigger job done. Told my gunsmith I wanted the pull between 5 and 6 pounds. He did my EMP 9mm and got it down to 3.25 which is way to light for my ever day carry. 5 to 6 pounds will do just fine. Should have it back by the middle of next week.
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Old 10-18-2012, 04:17 PM   #13
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jrprich, how many rounds have you shot since the trigger job? Any light primer strikes?
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Old 10-18-2012, 04:47 PM   #14
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Quote:
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jrprich, how many rounds have you shot since the trigger job? Any light primer strikes?
About 350, no light strikes so far.
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Old 10-23-2012, 03:26 PM   #15
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Picked up my P938 today from my gunsmith. When I dropped it off he measured the trigger pull at 8 pounds. He polished all the internals but did not cut or replace anything thereby maintaining the Sig warranty. The pull was reduced from 8 to 6.5 pounds which for a concealed carry gun is just fine for me. The pull is very smooth and crisp. Very happy with the results.

Last edited by sigmeister; 10-23-2012 at 03:28 PM.
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