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8/22/2014 4:19:20 PM
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TacticalPino
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Posted: 6/25/2013 5:33:52 PM
Hey all,

For those Sig P938 owners, I did a trigger job on mine and it came out great! Stock pull was 7.5 and gritty. Got a stainless trigger from partsproduction.com, Wolff reduced power hammer spring (20lbs), and took it apart, polished all contact points, and frog lubed. Current trigger pull is 4.5 and nice, smooth and crisp. LGS gunsmith verified and approved

I used the vids on youtube, and a few threads over at sigforum to do it. I've got experience working with glocks, but had none whatsoever with 1911 style guns. It's def more complex, and took a little longer, but after multiple assembly/disassembly to adjust things, I've got it down to a science. A couple things I noticed:

1. The reduced hammer spring, polish, & frog lube only dropped the trigger pull down to 6lbs. I wasn't happy this first go around so I went back in, polished a little more, and did 2 more frog lube treatments.

2. The biggest change in reducing trigger pull came from tweaking the sear/disconnect spring. My advice would be to make small adjustments at a time, re-install, and check. Sure it's a hassle to have to assemble/reassmble each time, but now I am confident I understand how my gun works. I looked at some 1911 sear spring vids and used just a plain pair of pliers to adjust the tension.

3. If you get the parts production stainless trigger, it comes with a small post with a rounded head to place inside the trigger bar spring. I found that even after polishing this part, the trigger was gritty. I took it out, and it's smooth as butter. It looks like the trigger bar comes into contact with more metal surface area with the pin in the spring vs. just the spring itself. It didn't change the trigger pull weight, only the gritty feeling.

4. The trigger pin was a pain. I've read on other forums of people having the same issue. I even broke one punch trying to get it out. I ended up finding a cupped starter punch and worked like a charm. I also dropped some oil in and let it sit for an hour. My advice would be to def use a cupped punch... and know that you may really have to wail on it the first time. Every other time after was easy.

5. If you lose your trigger spring, feel free to PM me. I have extras. Ask me how I got them. I heard it shoot out while punching out the trigger bar pin and spent 2 hours looking for it. I finally gave up and ordered a few from Sig (to justify the S/H), went back to start polishing and miraculously the spring was still in the trigger! But, I'm sure other 938 owners may run into this problem so feel free to PM.

6. Frog Lube is the best. Currently working on Frog Lubing all of my other guns at the moment.

Safety & function checked, then took it out after I finished and shot 300 rds of various ammo (WWB, Wolf, Fed, Fed Hydrashock, Speer +P with no malfunctions.

That's it, next time I do a detailed clean I'll see if I can get a video or some pics, but if you have questions feel free to PM me.
roadrash
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Posted: 6/26/2013 5:45:07 AM
[Last Edit: 6/26/2013 5:48:10 AM by roadrash]
the hell with frog lube
TacticalPino
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Posted: 6/26/2013 10:24:49 AM
Originally Posted By roadrash:
the hell with frog lube

Not a fan? Bad experience?
OilyPablo
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Posted: 6/26/2013 5:19:12 PM
Sounds like a plan. I'm very close to buying a P938 - I was waiting for Sig to get the kinks out.

A good lube is important but I wouldn't depend on, make it smooth without lube and then lube is my general practice.
It's simple: If you don't like guns, don't buy one.
M1Riflenut
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Posted: 6/29/2013 9:10:22 PM
Don't know if you saw my post in a previous thread about my 938 trigger woes. Was on the verge of just dumping the P.O.S but decided instead to just fix all the problems myself, the first one being the most horrible trigger of any gun I've owned in the past 30 years. I do my own trigger work on many other types including 1911 so this one was no big deal just things are smaller. It just pissed me off that it was like this new out of the box considering the price they ask for them and that I've never had issues with any Sig's in the past, and the fact that when I took it directly to Sig they did'nt think it had any problems and was fine.
Anyways, I had a trigger on it that would not break on the scale of my RCBS gage, I can only estimate it was around 14 to 20lbs based on how far the pointer went past the scale, and it was never consistant, sometimes felt like it would'nt let go at all. When I got it apart the hammer sear surface looked horrible, an investment cast piece POS that looked like it was never finished properly. The sear itself looked fine and finished although machining marks were visible. I worked the hammer until I had full polish on the contact point and all "flashing" was gone. Reassembled and it was a major improvement, now broke at 8lbs. Took it apart to do the final finish and polished both the sear and hammer with a dremel buffer and extra fine compound, cleaned it, coated the surfaces with marking blue and reassembled to check engagement which was near perfect, cleaned off the blue and reassembled. I ended up with it breaking cleanly and consistently just under 6lbs which is fine for me and a 100% improvement to what I had to start with. Next I have to shoot it again to see if my sights are off as bad as it seemed originally. Hard to tell exactly with the original trigger it had, there was just no way to keep it on target having to squeeze it so hard to fire.
FWIW, the tag on my case says it was made January 2013.
TacticalPino
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Posted: 7/12/2013 5:59:03 PM
Yea I will def agree that for the price I paid, it should have had a much better trigger. But it was a fun learning project and it's now my favorite gun to shoot... my glock 19 is still my EOTWAWKI gun, but the 938 is my EDC: