S&W .40 Sigma trigger mod

Discussion in 'Technical Questions & Information' started by 1shot1k, Jan 14, 2009.

  1. mogunner

    mogunner Well-Known Member

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    Don't ask them about a "trigger mod" or they will get all huffy with you and won't do a thing for you.However, if you complain that the trigger pull is gritty and 'catches' as you pull the trigger, they'll have you send it in and when it comes back to you it will be all slicked up.

    One note, the newest ones have the pins "peened" in the sear assembly to make it very difficult to take it apart and clean up, probably a liability CYA by S&W.

    For those low shooters, here is a shot of my 40VE with the Glock HiViz sight installed. Raises your POI about 2" at 25 yards.

    [​IMG]

    [​IMG]
  2. Rocketman1

    Rocketman1 Well-Known Member

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    Thanks for the additional info mogunner.
    I have a low shooter, but it has nothing to do with the sights, it's the hard trigger.
  3. mcw120566

    mcw120566 New Member

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    I have two Sigmas, and have done the trigger mod on both of them, I would consider them to one of the best point and shoot guns for the mony on the market. They will shoot anything that I throw at them, and do it with consistancy.
  4. mjsnook

    mjsnook New Member

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    I had an SW40F and I really liked the gun...except I hated the damn trigger. I wish I had found this prior to getting rid of it.
  5. bomar

    bomar New Member

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    Same here.. my Sigma shot flawlessly and dead on! I loved it but my finger didn't. After 7 shots, I was done for the day!
  6. Rocketman1

    Rocketman1 Well-Known Member

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    I found this trigger kit for the Sigma at Apex Tactical and was wondering if anyone here has tried it.
    They have a video on how to install the kit which looks straight forward. I would think for $20 bucks you can't go wrong, and could always revert back to the original springs if need be.

    https://apextactical.com/store/product-info.php?pid66.html

  7. Rocketman1

    Rocketman1 Well-Known Member

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  8. stumpjumper

    stumpjumper Member

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    I'm going to get one at apex for my sd40ve. after i get the case bulge issue cleared up
  9. Rocketman1

    Rocketman1 Well-Known Member

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    I just installed the kit in my Sigma VE9 tonight, so hopefully I will be able to get to the range this weekend to test it out. I notice a significant difference when dry firing. It took me a couple of hours to get everything done. I had a little trouble getting the stricker block spring out, but other than that work on the slide was for the most part easy. The trigger return spring was easy to take apart, but putting everything back together was a real bare. It took me 1-1/2 hours. I think the main problem was my eyes, and the lack of good light. Not an easy task when you where bifocals. If you have good young eyes it shold be easy.
  10. stumpjumper

    stumpjumper Member

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  11. stumpjumper

    stumpjumper Member

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    ok I messed that reply up. left my response in the quote
  12. Rocketman1

    Rocketman1 Well-Known Member

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    That's pretty cool, actually coming from the tech. Tells me they know a lot of people are going to do what it takes to modify that trigger. I figure that os exacly what I would do, put in the original springs.
  13. Rocketman1

    Rocketman1 Well-Known Member

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    Update on Apex spring kit and Apex Enhanced Trigger Kit

    I recommend installing both the Apex Spring Kit and the Apex Enhanced Trigger Kit. At first I only installed the spring kit. While the spring kit worked as advertised, and reduced the trigger pull a great deal, perhaps by half, I was not completely satisfied with the results. Perhaps my shots improved somewhat, but that long trigger pull still made me anticipate when the trigger was going to break.

    I feel the Apex enhanced trigger was well worth the money. Apex advertises that it reduces the pre-travel by 20% and the over travel by 10%. I think that it reduced the pre-travel a great more than what they advertise, perhaps by as much as half, but it could also be because the trigger is more comfortable. The enhanced trigger also reduced the trigger pull weight by at least another 10% more in addition to what the spring kit did.

    The safety on the Apex enhanced trigger is like that of a Glock. On the stock trigger the entire tip or bottom half of the trigger was hinged, so I never could understand how the safety actually did anything to prevent a miss fire if snagged on clothing or something similar. Therefore I think the enhanced trigger is somewhat safer, but the only real safety is between the ears.

    The only hard part about installing the spring kit and the trigger was getting everything back together. I had trouble getting everything lined up, especially getting the trigger return spring through the slave pin. It didn’t go any easier the second time when I installed the enhanced trigger.

    Everything tested out fine when dry firing, so it was off to the range to try it out. First shot was fine, but when I tried the second shot the trigger was dead. The trigger was not capturing the sear. (See picture below of properly captured sear.) With the slide off the frame, the trigger would return and capture the sear, but with the slide installed on the frame, it would not. The trigger did not have enough return to capture the sear when actually firing.

    The one thing good I can say about my Sigma is that it is very reliable. I have never had one failure of any kind, and I want to make sure it stays that way.

    I ended up using a fine emery board, to file a very small amount of material off the front part of the trigger where it makes contact with the frame. (See second picture) I did not have to remove very much at all, probably no more than 1 or 2 hundredths of an inch. I was able to do this with the slide off, but without removing the trigger from the frame. With everything testing out fine, it was back to the range.

    After sending about 50 consecutive rounds of lead down range, the trigger stopped resetting again. I think it probably had something to do with the gun getting hot. I field stripped it and took a little bit more material off the front of the trigger. It didn’t take long for me to send 100 more rounds down range, with everything working just fine.

    The trigger made a world of difference. Nice crisp break, and much smoother than before. My accuracy defiantly improved, but not as much as I would like. Time will tell.

    sIGMA pICTURES 017 Marked.JPG sIGMA pICTURES 028 Marked.JPG sIGMA pICTURES 011.jpg sIGMA pICTURES 012.jpg
    Last edited: May 18, 2014
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