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Elusive hammer follow issue resolved with new grip

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I was having occasional hammer follow on a 2011 open gun.  It was a challenge to diagnose because the hammer follow would only occur during live fire. I went through the usual suspects.  First I tried adjusting the sear spring, but it would still happen even with up to a 4lb trigger pull.  Next, I replaced the sear and hammer with new EGW parts.  Using trigger adjustment pins I could see that there was very good positive engagement, and again, I couldn’t replicate the hammer follow except during live fire.  I had already checked the grip screws which were Loctited after prior experience on a different gun on which loose grip screws causing hammer follow.  In order to see exactly what was going on during live fire, I fired the pistol with the grip safety removed.  Apparently during live fire, the left leaf of the sear spring was jumping off the sear and would settle under the sear, pushing up from the bottom.  It was the plastic STI grip that was either cracked or worn to the point that it was allowing the sear spring to move under fire.  I couldn’t find any visible cracks in the grip. After replacing the grip, the pistol is up and running, with the original sear, hammer and sear spring. 

 

I should have suspected this issue was slowly in the making.  About a year ago, the left leaf began slipping off to the left of the sear.  After reading around the forum, I fixed this by shimming the sear spring so it wouldn’t fall off and it worked fine for over a year.  

 

One possibility that I did not experiment with was simply changing the grip screw bushings.  I don’t think this would have solved it because when observing the amount of play the sear spring had in the new old grip vs the new one, there was significantly less in the new grip.

 

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I had this same problem. You can also peen the sear spring towards the bottom to eliminate the wiggle room within the grip.

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Any idea how many rounds it took for the plastic grip to start showing problems?

 

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Not sure.  I think the problem was unique to this gun.  I have several other 2011's with more rounds than this one and they show no signs of similar grip issues. I guess it's just something to keep in mind when diagnosing hammer follow, along with the other things I tried.

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Thanks for posting  this, I  would  never have thought  of  the  grip  causing hammer follow

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i have half frame  installed in  plastic grip.(for my experiments) . after i saw this problem i added to leaf spring 1.5 mm to eliminate this problem.

 

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On 10/9/2018 at 3:52 PM, SlappyMcTrigger said:

I had this same problem. You can also peen the sear spring towards the bottom to eliminate the wiggle room within the grip.

Thanks- I bought a used 2011 and the spring was peened out as you describe. I never understood why they did it until now!

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