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Having an Issue with GP100

This is a discussion on Having an Issue with GP100 within the Ruger Double Action forums, part of the Pistol & Revolver Forum category; I've had a GP100 for about seven years now and have been quite pleased with it. I installed a Wolff mainspring recently (8.5 lbs). I ...


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Old January 11th, 2017, 08:04 PM   #1
 
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Having an Issue with GP100

I've had a GP100 for about seven years now and have been quite pleased with it. I installed a Wolff mainspring recently (8.5 lbs). I fired about 70 rounds through it with no issues, cleaned it thoroughly, and put it away. A couple of days later I got it out for a little dry fire practice and found the trigger pull had gotten insanely heavy, so heavy that sometimes I almost need two fingers to pull the trigger. The same resistance is there when cocking the hammer. I put the old mainspring back in, but this changed nothing. I have all the mechanical understanding of a possum, so I thought I'd tap into the brain trust here. Any ideas on what's going on and how to fix it? All I can think of is maybe the hammer strut gas gotten bent, or a burr in it, something that impeded the compression of the mainspring. Thoughts?



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Old January 11th, 2017, 11:42 PM   #2
 
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Possibly the trigger spring has debris in it? I'm sure you know there's a correct orientation for the mainspring and strut assembly in the grip frame...
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Old January 12th, 2017, 02:25 AM   #3
 
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Or the hammer strut is in backwards.

When you say "cleaned it thoroughly" did you take it apart?
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Old January 12th, 2017, 04:29 AM   #4
 
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Or the hammer strut is in backwards.

When you say "cleaned it thoroughly" did you take it apart?
I made sure the strut was facing the right way.

I did not disassemble to clean. I just opened the cylinder.
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Old January 12th, 2017, 04:44 AM   #5
 
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My trigger was getting harder to pull & would bind every 3rd or 4th cylinder turn. Wasn't sure if it was the trigger, seemed like the ejector rod wasn't true & causing friction too.

It turned out to be some crud/debris had reached it's way inside the ejector rod (inside the cylinder area)
Had a gunsmith take apart, clean the ejector rod/cylinder & then smooth out any edges surrounding trigger. I figured since he had it apart might as well have the trigger cleaned up too.
See if the cylinder spins freely when open, it may help to find problem

Works great & no issues in over 5 years.
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Old January 12th, 2017, 06:31 AM   #6
 
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Need some clarification please. Is the trigger incredibly hard to pull all the way through it's cycle, or is it just really hard to get it pulled far enough back at the very end of it's cycle to release the hammer?
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Old January 12th, 2017, 08:35 AM   #7
 
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Need some clarification please. Is the trigger incredibly hard to pull all the way through it's cycle, or is it just really hard to get it pulled far enough back at the very end of it's cycle to release the hammer?
hard throughout the cycle, and the difficulty can vary with each pull of the trigger. One pull will feel almost normal while another will be so heavy I almost need two fingers to do it.
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Old January 12th, 2017, 08:52 AM   #8
 
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The cylinder is rubbing on the barrel

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Old January 12th, 2017, 09:50 AM   #9
 
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Been awhile since I've had mine apart. Just brainstorming, you couldn't have possibly reversed the hammer strut/mainspring support bracket?
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Old January 12th, 2017, 01:09 PM   #10
 
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Call Ruger.
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Old January 12th, 2017, 01:29 PM   #11
 
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The hammer strut main spring in backwards will cause it to cock funny, but not hard to rotate. Ask me how I know. I believe there is some FOD some where in the action causing the problem.
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Old January 12th, 2017, 03:58 PM   #12
 
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Been awhile since I've had mine apart. Just brainstorming, you couldn't have possibly reversed the hammer strut/mainspring support bracket?
Nope. I just checked, and in the course of so doing dry fired it and for the most part it behaved itself. It still felt a tad heavy, but it wasn't nearly as bad as before.
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Old January 12th, 2017, 04:06 PM   #13
 
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The hammer strut main spring in backwards will cause it to cock funny, but not hard to rotate. Ask me how I know. I believe there is some FOD some where in the action causing the problem.
Well, I don't know if it means anything, but in the course of seeing if I had it in backwards, I took it out, turned it around, and put it back in and could not cock the hammer at all, nor pull the trigger. In fact, I could barely get it back out. Taking this as a clear sign this was NOT the way the strut was supposed to go in, I took it out and put it back the way it originally was. I'm woundering if that resulted in the strut being bent, slightly enough that my middle aged eyes can't detect it but enough to affect performance.
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Old January 12th, 2017, 04:08 PM   #14
 
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The cylinder is rubbing on the barrel

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No, the barrel/cylinder gap remains clear and open throughout the whole trigger pull cycle.
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Old January 12th, 2017, 04:09 PM   #15
 
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No, the barrel/cylinder gap remains clear and open throughout the whole trigger pull cycle.
Is anything bent

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