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938 grip screw stripping?

This is a discussion on 938 grip screw stripping? within the P238, P938 Pistol forums, part of the SIG Sauer Pistols category; Originally Posted by drband New screws arrived from Sig today. I carefully replaced the missing one and it threaded in and snugged up nicely. I'm ...


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P238, P938 Pistol All variations P238, P938

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Old 01-10-2017, 05:10 PM   #31
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Originally Posted by drband View Post
New screws arrived from Sig today.
I carefully replaced the missing one and it threaded in and snugged up nicely. I'm going to leave it as is and watch for loosening. The new red stuff (I'm convinced it is vibra-tite) seems to be locked in well.

No need for other locking measures.
Keep an eye on the replacement screw. I replaced the top left screw on mine and it shoots loose after a while. I've had all four screws off the grips, but it seems like the top left screw is the only one that loosens on my P938.
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Old 01-10-2017, 05:45 PM   #32
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Keep an eye on the replacement screw. I replaced the top left screw on mine and it shoots loose after a while. I've had all four screws off the grips, but it seems like the top left screw is the only one that loosens on my P938.


Will do. If it loosens, I'll try the o-ring next.
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Old 01-11-2017, 02:52 AM   #33
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Will do. If it loosens, I'll try the o-ring next.
My only concern with o-rings is that you lose thread engagement. Could be a problem in a thin soft alloy frame.
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Old 01-11-2017, 03:27 AM   #34
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Challis grip screw O-rings which are low-profile and I find do not cause the grip screws to stand proud of the grips.



- Grip Screw O-ring, 24 pieces #9962



If needed I'll try the #60s but if they seem thick I'll order the o-rings suggested above.
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Old 01-12-2017, 06:49 PM   #35
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One question on the helicoil fix: where did you find the replacement screw & did it have a hex-head?
I ordered some stainless hex head screws in various (too long) lengths from eBay some Chinese outfit and happened to find some black ones (6mm iirc) at Menards. Had to file down to fit flush, or outside of, inner magwell.

The stripped thread seemed to hold fine when putting in a new screw but would pop right out after a dozen or fewer rounds fired. The new Helicoil seems to hold tight so far. The new screw is a bit different looking than the Sig screws, not to mention the thread difference too. If I weren't so lazy, I'd drill and tap the other three holes just to make it all match. Then again, why mess with it? It's my EDC beater. It goes bang every time.
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Old 01-15-2017, 01:16 PM   #36
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Lost another screw at the range today. Top left again.
Loctite will be next. Then a call back to sig if that does not work. Fortunately Sig sent me a couple when I asked for the missing screw last month. Hope this one holds.
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Old 01-31-2017, 01:59 PM   #37
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Success! Blue loctite holds the grip screw solidly. There are good threads left but evidently the top threads don't hold the factory "vibra-tite" stuff securely. I cleaned off the frame threads, screw threads, applied Blue Loctite and allowed it to dry overnight before checking. Multiple 7-Rd mags fired. No loosening. Rock solid.
No worries!
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Old 02-04-2017, 09:29 AM   #38
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If needed I'll try the #60s but if they seem thick I'll order the o-rings suggested above.
I have changed my thinking on the #60 o-rings for grip screw retention. The Challis o-rings linked have a much smaller cross-sectional profile than the #60's. A vastly superior solution to the problem than #60 o-rings or any thread locking compound.

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Last edited by Malicious Compliance; 02-18-2017 at 06:57 PM.
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Old 02-18-2017, 05:02 PM   #39
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Another update

Bottom right-hand screw popped out while shooting, and top (Helicoil) screw was loose. So, I went ahead and drilled and tapped the bottom screw. Filed down another metric screw (black) now both screws are matched on the right-hand side.

Took 1 full loop off the short 4mm Helicoil, and left the punch out tab intact this time.

Drilling my frame the 2nd time was about as fun as the first. But went easier and looks quite nice if I do say so myself!
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Old 03-07-2017, 02:14 PM   #40
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Was losing the lock washers quite frequently on my P220 (while managing to find the screws most times) with Hogue grips. Ordered a 100ct bag of M5 Tight-Grip External Tooth Lock Washers on McMaster-Carr, and seems to do the trick.
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Old 03-13-2017, 11:42 AM   #41
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Grip screw (top left) is gone again after 2 range trips. I got a shipping label from Sig and shipped the gun in today.
Oh, and now there's a light strike/FP block issue, too. Hoping for a good (final) resolution from Sig.
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Old 03-15-2017, 03:35 PM   #42
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Had this happen with my P938 a few years ago as well. Only the third time I had it out, maybe had 150 rounds through it. Lost one in the weeds to. Called Sig and they sent me two new screws and recommend Loc-Tight. Good customer service and it worked, still disappointed that I had to do this on a new $750 gun.
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Old 03-15-2017, 06:05 PM   #43
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Yep!! Blue Loctite on the grip screws, and Red on the guide rod.

G.
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Old 03-23-2017, 03:26 AM   #44
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Sig is replacing my p938 frame. No BS customer service! I am pleased. I should receive it at my LGS sometime next week.
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Old 03-25-2017, 06:21 AM   #45
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Sent my 938 SAS back to Sig yesterday. The left grip screw hole is stripped. I've been babying it for a while by putting a piece of duct tape over it when at the range. It also proved it was popping out as opposed to screwing out. I figured it would have cost me about 55 to purchase what I needed to helicoil the thing so I decided to spend the $55 sending it to Sig and maintaining my warranty. This pistol is the one that had the first documented MSH upgrade in it here on Sig talk and has over 2000 flawless rounds through it since the upgrade. I let you know the outcome.
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