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-   -   P938 Recoil Spring Guide Rod Issue (https://sigtalk.com/p238-p938-pistol/387966-p938-recoil-spring-guide-rod-issue.html)

Mr Gun 07-02-2020 02:34 PM

P938 Recoil Spring Guide Rod Issue
 
2 Attachment(s)
I reassembled my 938 and noticed the tip of the guide rod is protruding past the end of the barrel about 1/8 inch. It seems to shoot fine but I don't remember it being like that before.

I've tried to compare it to pics on the Sig site and others but it's really hard to tell if mine is really that much different. I've attached a couple of pics of mine. Anyone else have an "outie" guide rod :-)

Thanks!

ThnkFrst 07-02-2020 03:01 PM

Two Possibilities.
 
1 Attachment(s)
1. The takedown lever isn't installed correctly. But you say that it seems to shoot fine so it's probably #2.

2. Your two piece guide rod is coming apart; the rod is unscrewing from the base. See attached:

Attachment 350436

If it's #2, you can a) apply red locktite to the thread and reassemble it, b) call SIG CS and request a replacement, or c) replace it with a one-piece guide rod from "SSGuiderods": ssguiderods.com. Or do all three.

I wouldn't shoot it any more as it is. It will soon launch down range.

Plunker 07-03-2020 04:53 AM

Took my guide rod apart and sprayed with gun scrubber to remove oil. Then some red loctite on threads. Let it sit over night and it has been tight ever sense.

Before I would shoot a few rounds to a box and rod would be slightly loose.

Frogdog 07-03-2020 04:57 AM

Two piece SS guide rods are the safest kind. Sig blew it on two piece guide rods. Bad design, bad QC.

Mr. Sig 07-03-2020 01:39 PM

https://sigtalk.com/legion-series/37...guide-rod.html

https://sigtalk.com/p238-p938-pistol...ew-member.html

Mr Gun 07-07-2020 02:32 PM

1 Attachment(s)
Quote:

Originally Posted by ThnkFrst (Post 5464820)
1. The takedown lever isn't installed correctly. But you say that it seems to shoot fine so it's probably #2.

2. Your two piece guide rod is coming apart; the rod is unscrewing from the base. See attached:

Attachment 350436

If it's #2, you can a) apply red locktite to the thread and reassemble it, b) call SIG CS and request a replacement, or c) replace it with a one-piece guide rod from "SSGuiderods": ssguiderods.com. Or do all three.

I wouldn't shoot it any more as it is. It will soon launch down range.

Yep, you were correct, it was #2. The rod had come unscrewed two to three turns. I've attached another pic where you can see the treads at the end of the rod. I plan to order a new one piece rod but in the meantime I'll probably use the red locktite. Thanks for the info!

ThnkFrst 07-07-2020 03:28 PM

IMHO, every P938 owner who has experienced this failure should call SIG and "request" a replacement...every time that it happens. It should cost them each time for failing to get this problem under control. They got better for a while (based on reports seen here on ST) but it seems the failures are on the rise with the Legion model; new coating, new supplier, who knows.

Replacing it with a one-piece version is certainly an option, not one I've gone with, but still an option.

I think that the guide rod in the 938 sees a lot of bending load during the firing cycle and flexing of the threaded joint. If the pistol is fired a significant amount when the rod is unscrewed from the base, I think it can compromise the threads which makes it a poor candidate for the locktite fix. JMHO.

Mr Gun 07-07-2020 06:03 PM

Thanks @ThnkFrst, I appreciate the info. I will call Sig this week. Last time I was on hold for 53 minutes but that's what hands-free speaker phones are good for!

I am surprised I didn't notice the loose rod when I reassembled the gun. Of all my handguns, the 938 is the hardest to assemble because you have to make sure the spring doesn't bend and kink up when you are compressing it to fit behind the barrel lug. I usually insert another metal rod, like a cleaning rod into the muzzle end of the spring to hold it straight and firm while I compress from the other end. I guess all that pushing and twisting loosened the rod as I reassembled and I didn't notice it. I am certainly not a gunsmith but I don't see why the rod isn't made as one piece anyway.

ThnkFrst 07-08-2020 03:44 AM

Why?
 
Quote:

Originally Posted by Mr Gun (Post 5473412)
I am certainly not a gunsmith but I don't see why the rod isn't made as one piece anyway.

In a word, cheaper.

Czechvar 07-28-2020 08:32 PM

I have two 938 Legions, and I switched both to one piece GR’s before shooting them...no problems...

Silversides 07-29-2020 12:10 PM

Just get a one piece ss guide rod and get it over with. I did and quit thinking about it. Sig made a mistake and won't fix it properly. Heck if I understand their "thinking".


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