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P938 Two-piece Guide Rod - Permanent Fix? Login/Join 
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OK, I am at my wits end with my P938. I have ~ 1700 rounds through it now and the guide rod keeps loosening despite thorough cleaning and application of Loctite Red. I went to the range today and got 35 rounds off before the guide rod was protuding.

Any other solutions?
 
Posts: 1655 | Location: Escaped Upstate NY for Texas | Registered: April 08, 2012Reply With QuoteReport This Post
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Picture of vthoky
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I'll show my ignorance and ask, why is the guide rod a two-piece thing? Could it be a single piece?

I ask, not to be a smart-aleck, but because I don't understand.

-----

Edit: having taken a look at it, I see it's likely an economics thing. That could be machined from a solid, but would be more economical as a two-piece.



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Posts: 8079 | Location: Hokie Nation! | Registered: July 15, 2007Reply With QuoteReport This Post
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Yes, it is a 2 piece due to the economics and manufacturability of making that design as a single piece. I have given some limited thought to a redesign, but have not put it into motion, yet.
 
Posts: 1655 | Location: Escaped Upstate NY for Texas | Registered: April 08, 2012Reply With QuoteReport This Post
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I wonder if the "rod" could be serrated and press-fit into the "block," rather than them being threaded together.



Support our troops, and our veterans.
Go Hokies!
New favorite quote from the golf course: "It's not the club, son."
 
Posts: 8079 | Location: Hokie Nation! | Registered: July 15, 2007Reply With QuoteReport This Post
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quote:
Originally posted by vthoky:
I wonder if the "rod" could be serrated and press-fit into the "block," rather than them being threaded together.


Your idea has merit.
 
Posts: 1655 | Location: Escaped Upstate NY for Texas | Registered: April 08, 2012Reply With QuoteReport This Post
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I'm tempted to pull mine apart and start measuring.

We do a lot with serrations at work... it's not that tough to do (given a proper die), and you really have to force things apart if pressed together correctly.

Now I'm wondering if I can get some time with the CMM this week.

ETA: Heck, a new one is just $22. Maybe I should just go ahead and get a spare, and start measuring from it. I'd have a "sample of two" on hand for measurements....



Support our troops, and our veterans.
Go Hokies!
New favorite quote from the golf course: "It's not the club, son."
 
Posts: 8079 | Location: Hokie Nation! | Registered: July 15, 2007Reply With QuoteReport This Post
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I just cleaned and degreased mine and applied red Loctite again - it started coming apart. I was more fastidious cleaning this time.

If the threads come apart, I wouldn't hold a lot of hope for a spline press fit either. Before that, I'd cross drill and put pin through the threaded area for a SS roll pin.

Heard there is a one piece aftermarket guide rod to be out shortly for around $40 something. No other info though.
 
Posts: 1193 | Location: Nevada, United States | Registered: April 13, 2010Reply With QuoteReport This Post
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The P220-10mm also has a two piece guide rod, but the spring is captive on the rod. I noticed mine backing out several months ago, and I did the thorough cleaning, inside and out, with acetone, used red loctite to reassemble, and so far it has held. Perhaps the captive spring helps keep it from unscrewing itself.
 
 
Posts: 7919 | Location: South Congress AZ | Registered: May 27, 2006Reply With QuoteReport This Post
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I disassembled and soaked both pieces again in acetone then thoroughly vcleaned out the threads again. This time I used JB Weld instead of Loktite during assembly. I let it set for 24 hours and then reassembled. Thus far I have put 250 rounds of mixed ammo down range, including 14 rounds of +P 124 gr HST's and no movement.

I got a spare guide rod from Sig just in case anything funky happens, but thus far it looks promising.
 
Posts: 1655 | Location: Escaped Upstate NY for Texas | Registered: April 08, 2012Reply With QuoteReport This Post
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