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SP101 Hammer Pin Won't Stay In

This is a discussion on SP101 Hammer Pin Won't Stay In within the Gunsmithing forums, part of the Firearm Forum category; I bought this SP101 about 11 months ago but today is the first time I shot it. My son and I put 50 rounds of ...


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Old January 21st, 2017, 04:07 PM   #1
 
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SP101 Hammer Pin Won't Stay In

I bought this SP101 about 11 months ago but today is the first time I shot it. My son and I put 50 rounds of .357 145gr through it today. When we got home and set down to clean our guns I noticed that the tab on the pin was turned as in the photo because the pin had backed out a little. It had always set a little proud from the start but it seemed solid. I took off the grips and released the spring tension. Then I could push the pin in a little further, back to where it was when I got it. It still sits about 1/2 as high as the picture. I couldn't see any burrs or edges when I had the pin out but it just won't set in flush as the one on my son's SP101 does.

Has anyone else experienced this? I can't tell if the problem is the pin or the slot. I may need to contact Ruger for a solution.

Tom
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Last edited by TebSp101; January 22nd, 2017 at 08:26 AM.
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Old January 21st, 2017, 04:27 PM   #2
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Take out the pin and see if it's bent. The tab should have a clean 90 degree angle to the pin. Perhaps the tab is bent up a bit - if so try to straighten it. It should be flush in the frame.
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Old January 21st, 2017, 09:18 PM   #3
 
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The tab does not look to be perfectly square with the pin. I'll check that closer when I get home. I'm in AZ right now. Thanks for the reply.

Tom
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Old February 3rd, 2017, 06:20 AM   #4
 
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Mine was very proud too, but it didn't turn like yours did. It was almost that high though, so I started messing with it to see why.
I found mine to be tapered from the nose of the pin to the tab area by only a few thousandths of an inch. But the taper was greater from midway to the tab area enough to make the pin stick hard in the frame before it seated fully.
I took everything out of the frame and inserted the pin only into the hole from both ways just to make sure the holes weren't tapered too. The pin stopped at exactly the same spot each way, so that told me it was the pin not the frame or hole size or alignment.
I then took a very fine mini file to the pin while turning the pin chucked in a drill motor. I then polished it until the pin sat nicely in the frame. Now mind you I only took off a couple thousandths of just the last 1/8" of the pin near the tab, everything else fit fine.
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Old February 3rd, 2017, 07:36 AM   #5
 
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Mine does stand up slightly.
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Old February 3rd, 2017, 03:26 PM   #6
 
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why don't you send it back to Ruger and let them correct it for you?
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Old February 4th, 2017, 04:03 AM   #7
 
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As you can see, the grip panel holds the pin in place. I've seen them back out a bit but never to the point that the pin can rotate out of the recess in the frame as it did in the second photo.
You could let Ruger look at that and they could replace the pin. I suspect the pin is slightly tapered and the hammer is walking it out.
Alternatively, a tiny bit of JB weld applied to outside of the tab, near the end were the grip panel touches it, would probably do the trick. The JB weld would be hidden by the grip panel when the grips are installed. You're not playing with an expensive part there and it could removed if desired.
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