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P938 Trigger

4K views 29 replies 13 participants last post by  ThnkFrst 
Agree, the P938 has way to heavy a trigger for my taste.

A good trigger job can get a P938 trigger as light and crisp as a good 1911. My P938 is at a hair under 3 lbs, no creep, no overtravel. If you search posts here, you can find how to do this or have it done if you wish.

SIG won't do action jobs on them. I don't do commercial work. TheSigArmorer does work on them.

Swapping the plastic trigger for metal has no significant affect on trigger pull. Going to a weaker mainspring helps a small amount. Straightening most of the bend out of the ejector spring and some out of the sear can get you into the 5 lb range. To get lower requires taking some of the positive angle out of the sear (requires proper fixtures and tools unless you are gunsmith deity and can do it by hand eyeball - I use the fixtures), and/or thinning the sear/ejector spring from .025" thick to about .021" thick through the area that flexes. That spring is much stronger than need be, as SIG wants the trigger pull high and that's a major contributor.

One way to get a trigger overtravel stop on the P938. The little TIG weld is filed down to fit, and bonks against the mag release which acts as the trigger stop on the P938.

 
Does any spring, altering the pull weight, trigger job interfere with the Sig warranty? I assume the work has to be done by a Sig Armorer if the firearm is to remain under warranty.
It might, especially if the altered part was deemed by SIG to be causal to the warranty issue.

Robert Bourke "TheSigArmorer" is a Sig Armorer, so you're good there.

For other brave souls, who might do such work, the spare parts we are dealing with are inexpensive. Should warranty work be needed for something that is not easily field fixable, then the gun can be returned to stock before repair.

I've never returned a gun to a manufacturer, I'm 72 and have been shooting since I was a young teen.

I've done action jobs on a dozen P938's, one truly horrible example had a trigger pull of just over 12.5 lbs, my Lyman Digital scale just went into overload as the hammer released (spec for the gun is 7.5 - 8.5 to their QC guy must have a hellofa callous on his trigger finger to miss that one). Correcting the alignment of the sear/hammer engagement surface dropped the pull by 5 lbs!

These parts don't look to be hand fitted, nor are they machined after MIM moulding and heat treating (one of the things that keeps MIM parts costs down). Good quality or no (not trying to start the MIM debate again - I've done that before), anomalies can happen. If you are buying at a gun counter, and a trigger or whatever doesn't feel perfect, try to compare another of the model you're buying if you can.
 
My P938 has never been back for work/repair since I bought it, so it's likely the older style MSH. When I get time, I'll take it apart and look for wear. In either case, it seems like it might be worth contacting Sig to see about sending it in for them to check out.
You can visually inspect the condition of the old style MSH without taking anything apart except for removing the magazine. Look at the aft surface of the mag well, about an inch or inch and a quarter up, you will see a 1/8" diameter round hole in the spring, the old style MSH has a 1/8" round "nub" that engages that spring hole - the nub should still be round and filling that hole, rather than worn at the bottom and showing a gap at the top. Good lighting helps.
 
Yep, confirmed against a pic in the thread linked earlier. I'm assuming based on the gap at the top that it's showing some of the expected/typical wear? Plan to call Sig tomorrow to see if I can send it in.
Yup, that's a good depiction of an old style a fixin' to go from bad to dysfunctional. Sig will fix that - You might ask them to check the magazine catch while they're at it.
 
I like the trigger on my 938, it's stock. AS I see it this is not a target gun it is a self defense weapon. In most peoples hands it probably won't be used in competition for it's purpose I think it is good as is and accurate at 10 yards or so.
You are probably right.

Though there's always the principal of "different strokes" (of which I am one!).

TheSigArmorer used to have a youtube video up showing a P938 with action job being accurate enough for a steel gong at 140 yards for so.

Don't know why the video got taken down, or why one would normally need to focus on defensive shooting at 140 yards - the fast shooting was impressive though :).
 
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