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Main Spring Housing (MSH) Replacement Videos

This is a discussion on Main Spring Housing (MSH) Replacement Videos within the P238, P938 Pistol forums, part of the SIG Sauer Pistols category; Originally Posted by sig78257 Does the new spring push into the MSH with finger pressure? I have a 938 SAS about a year old with ...


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P238, P938 Pistol All variations P238, P938

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Old 09-23-2015, 05:10 AM   #1
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Originally Posted by sig78257 View Post
Does the new spring push into the MSH with finger pressure? I have a 938 SAS about a year old with 800 rounds that is starting to show wear and am debating sending it to Sig or ordering the parts and installing them myself.
Hogue has a couple of excellent videos regarding this modification. These videos should work well for you when using the new components.




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Old 09-23-2015, 05:46 AM   #2
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Old 09-23-2015, 06:20 AM   #3
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Originally Posted by sig78257 View Post
Does the new spring push into the MSH with finger pressure? I have a 938 SAS about a year old with 800 rounds that is starting to show wear and am debating sending it to Sig or ordering the parts and installing them myself.
The new sear spring installs in the slot in the new MSH much the same as the original design. But because the boss on the back of the new sear spring is deeper and larger in diameter than the old post on the MSH, the new sear spring goes into the slot at a steeper angle making it a little harder. These features are shown in the pic in post #31.

I found that it helped to get the sear spring started in the MSH slot, stand the MSH upright on it's base, then insert a screw driver in the hole in the sear spring and press it down into position. Once the boss on the back of the sear spring clears the upper edge of the MSH hole the spring snaps into position.

In the video that MC posted above (which is a very good video), the sear spring is removed (@4:40) by dropping the MSH down slightly and then pushing a tool thru the gap to push the sear spring off the detent post on the MSH. That works fine for the original sear spring and MSH.

When removing the NEW MSH/sear spring (somebody had to go first), things were a little different. The new sear spring takes much more pressure to get it to release out of the MSH; I couldn't/wouldn't push that hard. Instead, I made a small tool out of a block of nylon that I pressed against the upper ends of the sear spring (just below the trigger bar). Pressing the tool against the spring to relieve the spring tension on the sear/ejector with one hand, I pressed the sear pivot pin out of the frame with the other. Once the pin cleared the frame, the sear and ejector fell out and the MSH/sear spring could be easily pulled out of the frame.
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Old 09-25-2015, 01:47 PM   #4
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Great videos. Thanks, MC. But here's my question. Is the complete disassembly of the pistol shown in the videos a requirement if all I want to do is just replace the MSH/sear spring with the newly designed ones? I wouldn't think so but, hey, I thought I'd better ask.
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Old 09-25-2015, 02:28 PM   #5
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I wouldn't call the steps shown in the video a complete disassembly. The videos do show the correct and most efficient method to swap the parts in question, especially with the adjustments noted by TF.
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Old 09-29-2015, 07:03 PM   #6
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I've had a chance now to install three of the new MSH's and sear springs. A couple of the guns were showing wear, very glad we made the modification as these guns would have failed as mine did, eventually.

I agree with ThnkFrst, getting the sear spring installed to the MSH is a bit of a knack, I used an allen wrench, but it functioned as TF described with a screw driver.

The two videos posted earlier in this thread worked very well for me, the second install was done in about five minutes. I don't recommend rushing through this, it is not a race, you certainly want to do it right.

The trick I discovered to help ease the install is as follows:

At about the 1:50 mark of the second video, an excellent graphic is inserted, showing the relationship of the sear, the sear spring and the transfer bar. As I install the sear spring, I didn't worry about getting it behind the sear initially. I make certain both prongs of the sear spring go behind the transfer bar, but not the sear. As was described in the video, the sear never comes out of the firearm, the pin is pushed just enough to remove the ejector. While installing the MSH/sear spring, once both prongs of the sear spring are behind the transfer bar, it is easy enough to press down on the transfer bar just enough to rotate the sear into position, resting against the sear spring prongs and slipping in behind the transfer bar. I can't tell you how much time this saved me in doing it in this fashion compared to the first time attempting.

Other than this simple step, which simplifies the operation immensely, the videos are a very good representation of how to do the modification.

ETA: I should add that the one MSH I swapped out showing no wear is mine, that has been sitting unfired in my safe the past year since SIG replace the MSH with a Gen 1. The other two were guns used by friends for EDC.

Last edited by Malicious Compliance; 09-30-2015 at 11:40 AM.
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Old 12-26-2015, 07:44 PM   #7
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Was just reading this exchange. When I disassembled the MSH and pulled off the spring I notice the nipple that holds the spring in place was worn down. Is this common? I believe this is what led to my ejector getting stuck. Any feedback. I find it hard to believe this is such a weak point on such a great gun.
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Old 12-27-2015, 02:40 AM   #8
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Originally Posted by usaim218 View Post
Was just reading this exchange. When I disassembled the MSH and pulled off the spring I notice the nipple that holds the spring in place was worn down. Is this common? I believe this is what led to my ejector getting stuck. Any feedback. I find it hard to believe this is such a weak point on such a great gun.
I think that you are correct about the ejector getting stuck. See this thread for more details, in particular post #21:
How to Determine Original (Old) vs Revised (New) Main Spring Housing

Fortunately, SIG has redesigned the MSH and sear spring. Sounds like you need to get a set of the new "Gen 2" parts.
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Old 12-28-2015, 08:31 AM   #9
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Main Spring Housing (MSH) Replacement Videos

For P238 owners. Here's my conversation / experience with Sig Customer Service (Tim) this morning (12/28/15).
I called asking about the warranty MSH/sear spring upgrade. Short version: for the P238 (380 ACP), they have had no complaints or failures reported so the upgrade is NOT covered under warranty for that model. Tim implied the upgrade could be done to the P238 [of course] but I'd have to pay for it. I did not inquire as to what they would charge to do that. He had already mentioned shipping wasn't covered and that would be $55.

I did mention the two jams I had (where the slide had locked up) experienced during the first 500 rounds. His comment was that was well below a 1% failure rate and they would tend to consider that to be more likely a problem with the ammo or a dirty gun. I asked him at what point (percentage) they would consider it a gun problem. He said certainly if it was a 3 or 4% failure problem, they would want to take a look at it. [For the record & I told him so, I was using factory new Blazer target ammo]


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Old 01-24-2016, 03:44 PM   #10
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New member with a P938 that has not been fired yet. I probably overlooked this but (1) what is the reason for the modification and (2) is this something I will need to do with my new P938? - Thanks
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Old 01-24-2016, 04:03 PM   #11
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Take a look at the photos in the link that ThnkFrst posted - it shows how to see if your pistol has the old style MSH or the new design. If your P938 is fairly new, it may already have been built to the newer design. The problem is a "wear issue" and the potential it has to cause a sear spring failure - NOT something you want to have happen with a defensive weapon, where your life depends on its reliability.


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Old 01-24-2016, 04:06 PM   #12
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Old 05-17-2016, 11:07 AM   #13
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Originally Posted by Malicious Compliance View Post
Hogue has a couple of excellent videos regarding this modification. These videos should work well for you when using the new components.


https://www.youtube.com/watch?v=eyELm9Dt-AQ


https://www.youtube.com/watch?v=bLDgQaF9HyI
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Old 05-17-2016, 11:09 AM   #14
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