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Ruger GP100 Cylinder Lockup/Pawl Failure?

This is a discussion on Ruger GP100 Cylinder Lockup/Pawl Failure? within the Gunsmithing forums, part of the Firearm Forum category; When I try to fire in DA, the trigger sticks just as the pawl should be rotating the cylinder into position. The same thing happens ...


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Old January 1st, 2017, 02:08 PM   #1
 
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Ruger GP100 Cylinder Lockup/Pawl Failure?

When I try to fire in DA, the trigger sticks just as the pawl should be rotating the cylinder into position. The same thing happens when I try to fire in SA. I try to cock the hammer and it gets stuck in the same spot. I only fired 20 or 30 rounds today and the gun was spotless prior to shooting. This happened a few months ago but I had been shooting a lot so I thought the gun was really dirty, cleaned it, it stopped so I didn't think anything of it. This seems to be happening at random, more often the more I shoot it. I kept empty casings to try and it makes no difference if the cylinder is loaded or not. Any suggestions?

I begun disassembling the gun, took the mainspring out, still stuck. Took the hammer out, still did it. I determined that the issue is definitely somewhere in the trigger group itself. I bought the gun used back in 2014 and have only begun to see this problem in the past few months.



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Old January 1st, 2017, 02:14 PM   #2
 
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Check and be absolutely certain you have the hammer strut,

(inside the mainspring, in the handle) facing the proper direction.

(I did the same thing myself) Cheers, mate!
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Old January 1st, 2017, 08:35 PM   #3
 
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It is good that you eliminated the mainspring strut and hammer as a problem. The GP100 trigger group is robust, but can be affected by debris and improper reassembly, with the pawl and cylinder latch (cylinder stop/bolt) springs being a common issue. On the other side of the pawl spring, is the trigger plunger. The pawl spring tensions both parts. If you remove the trigger group from the frame, you can then inspect those parts, and the remaining parts of the trigger group. Another issue can be the trigger guard latch spring, which tensions the latch plunger and the trigger return. The 'tunnel' in the trigger guard unit that the spring and plungers travel in can have burrs and/or debris that affect the movement of those parts.
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Old January 2nd, 2017, 10:32 AM   #4
 
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Quote:
Originally Posted by firescout View Post
It is good that you eliminated the mainspring strut and hammer as a problem. The GP100 trigger group is robust, but can be affected by debris and improper reassembly, with the pawl and cylinder latch (cylinder stop/bolt) springs being a common issue. On the other side of the pawl spring, is the trigger plunger. The pawl spring tensions both parts. If you remove the trigger group from the frame, you can then inspect those parts, and the remaining parts of the trigger group. Another issue can be the trigger guard latch spring, which tensions the latch plunger and the trigger return. The 'tunnel' in the trigger guard unit that the spring and plungers travel in can have burrs and/or debris that affect the movement of those parts.
I had the whole trigger assembly in pieces last night. The pawl spring and cylinder latch spring weren't swapped because the pawl spring is too short to allow the latch to function. The trigger plunger actually can go in upside down and works more or less but doesn't properly catch the pawl spring. Pointy side on the front, cutout at the back on the bottom. I'll take a look at the channels where the springs go or maybe the springs themselves. Maybe there's something stuck in there. That's the only way it makes sense to me that this just started happening recently and only happens after I shoot.
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Old January 2nd, 2017, 01:14 PM   #5
 
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Another (small) possibility is that the cylinder is contacting the back end of the barrel, after it gets warm/hot (expands and closes the gap).
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