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How to Determine Original (Old) vs Revised (New) Main Spring Housing

This is a discussion on How to Determine Original (Old) vs Revised (New) Main Spring Housing within the P238, P938 Pistol forums, part of the SIG Sauer Pistols category; First, determine which version of the MSH/sear spring you have. Remove your left grip panel and compare to this pic: If you have the old ...


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Old 09-26-2015, 10:02 AM   #1
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How to Determine Original (Old) vs Revised (New) Main Spring Housing

First, determine which version of the MSH/sear spring you have. Remove your left grip panel and compare to this pic:



If you have the old style hardware then compare to this pic for signs of wear:
Attached Images
File Type: jpg P938:238MSH:SearSpringCompar.001.jpg (231.8 KB, 214 views)
File Type: jpg 938MSH.001.jpg (100.9 KB, 180 views)
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Last edited by incar; 09-26-2015 at 10:27 AM. Reason: Reinserted images
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Old 09-26-2015, 10:48 AM   #2
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Here are some more pics showing the differences between the old and new MSH/sear spring design:

Attached Images
File Type: jpg MSH:SS Compar.001.jpg (205.3 KB, 140 views)
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Last edited by incar; 09-27-2015 at 05:57 AM. Reason: Added large image
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Old 09-26-2015, 05:10 PM   #3
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Part Numbers & Nomenclature

Here is a table of the MSH and sear spring versions; Gen 1 and Gen 2 part numbers and nomenclature.

There are gaps in the info that I have (highlighted in yellow); if anyone has a sales order or packaging for those items and could post the part number, I'll update the table.

There are two G10 MSH versions that haven't been released for retail sale (highlighted in orange). If anyone is successful placing and order for them, please post that and I'll update the table.
Attached Images
File Type: jpg Gen2MSH:SS P:N.001.jpg (128.3 KB, 123 views)

Last edited by incar; 09-27-2015 at 05:58 AM. Reason: Added large image
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Old 09-29-2015, 01:47 PM   #4
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If I have the old one, does Sig recognize that there is an issue with them and do anything about it? I guess I need to search the threads.
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Old 09-29-2015, 02:05 PM   #5
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Any videos how to change out the old MS?
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Old 09-29-2015, 02:11 PM   #6
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Any videos how to change out the old MS?
http://sigtalk.com/p238-p938-pistol/46397-main-spring-housing-msh-replacement-videos.html#post560486
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Old 10-22-2015, 08:20 AM   #7
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Is Sig now replacing them? I spoke with them early in the summer, they offered to replace the MSH but said it would be the same part that was in it. I told them I'd wait till they had a real fix for the issue....Has that time arrived?
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Old 10-22-2015, 10:45 AM   #8
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Originally Posted by jtallen83 View Post
Is Sig now replacing them? I spoke with them early in the summer, they offered to replace the MSH but said it would be the same part that was in it. I told them I'd wait till they had a real fix for the issue....Has that time arrived?
I believe that the time has come. Since July, several members have sent their 938s in for warranty repair and had them returned with the Gen 2 spring and MSH installed. Several members have also reported taking delivery of new 938s with July 2015 production dates or later with the Gen 2 hardware installed.
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Old 10-22-2015, 01:31 PM   #9
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How to Determine Original (Old) vs Revised (New) Main Spring Housing

Sig hasn't actually issued a recall on the old MSH have they? I looked at my P238 last night and discovered the "old style" MSH. It didn't appear to show any burr developing but did have a little more spacing toward the top side of the hole. I haven't called Sig {yet} - is there any reason to do so especially if they haven't issued an official recall and the wear doesn't appear to be excessive. Probably wouldn't hurt to give them a call, eh?

Last edited by Busykngt; 10-22-2015 at 04:38 PM.
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Old 10-22-2015, 01:40 PM   #10
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I do not believe that SIG intends to issue a recall. I was told that the new hardware would be fielded as a warranty claim. My advice is to make a call and ask for a replacement.
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Old 10-22-2015, 03:52 PM   #11
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Just printed the shipping label, making it a two-fer by sending it with my P716 that is having ejection issues, hope they can get it ALL right!
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Old 11-01-2015, 01:42 PM   #12
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Has anyone received a replacement in G10 yet? Or better yet does anyone know if there's been any failures of the G10 housing?
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Old 11-16-2015, 07:34 PM   #13
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Has anyone received a replacement in G10 yet? Or better yet does anyone know if there's been any failures of the G10 housing?
Hello all...I'm new here and this is my first post. I just bought a P938 Extreme, with the G10 grips..Build date on the box was Aug 27 2015. According to the pics here, my gun has the new style spring with the larger hole. So it is available in the reptile G10.
This site is great, really glad I found it. This is my first Sig purchase, and it has been an amazing shooter so far. I read about extractors breaking and guide rods coming loose. My GR is very tight, I couldn't get it to turn. My grip screws had loctite from the factory. I removed my extractor and polished it slightly where it contacts the rim, basically removed the black coating, and polished it where it touches the slide. It has not skipped a beat, no FTF/FTE with any type ammo, 115, 124, 147...all shot great. both ball and HP. It does have the loose round in the mag issue, but my G19 (that I traded in to but my 938 ) did this also, just not as bad. I'll deal with that if it becomes an issue.
I'll keep looking around the site and learning from the group, lots of good reading so far.
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Old 11-22-2015, 11:27 AM   #14
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Hmmm. I wonder if Sig does much testing on their designs before they go into production. Have a P238 from 2014 with the old design, guess I will give Sig CS a call...again. Good thing I have the number on speed dial.
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Old 11-22-2015, 04:53 PM   #15
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PCHS4, if you make contact with them, would you please post the results of that exchange? I have an old style P238 I've be meaning to check with them too and just haven't had the chance to do it yet.
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