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Old 03-08-2012, 05:40 AM   #11
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The "bump" you are feeling is normal. It's when the FP stop forces the hammer down at it's rear travel terminus. I had to get two of my 1911s out of the safe to see/feel what you were talking about.

Trigger stop - 1911 Forum

That slight "bump" is something I've become accustomed to. I had to cycle the slides several times, with the hammer cocked, to re-discover this tactile sensation that I have come to filter out as normal.

This photo shows the uneven application of force to cock the hammer. The witness mark shows what appears to be more force applied to the right side of the hammer. I bet if you inspect the hammer pin you can see this condition causing uneven wear.

Trigger stop - 1911 Forum

I think this condition is caused by the FP stop rocking/rotating in the slide, or, the stop has worn and/or was not machined perpendicular to the slide's vertical plane. If this interface with the hammer isn't square it will induce side-loading on the hammer pin.
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Old 03-08-2012, 06:25 AM   #12
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Thanks Cane, I'll replace the stop and check the hammer pin. The black on the hammer was just a little oil but it's obviously the first place that touches the stop.
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Old 03-08-2012, 09:51 AM   #13
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I agree with Cane. I cannot add anything else. Good luck and keep us posted.

You may want to use a straight edge and seel if the hammer has a low spot where your oil marks are.

STI has a firing pin stop that you may want to look at purchasing. Here's the link:
http://www.brownells.com/.aspx/pid=12439/avs%7CManufacturer_1=STI/Product/1911-AUTO-FIRING-PIN-STOP
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Old 03-08-2012, 05:03 PM   #14
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Quote:
Originally Posted by progolfer_iii View Post
Thanks Cane, I'll replace the stop and check the hammer pin. The black on the hammer was just a little oil but it's obviously the first place that touches the stop.
Look beyond the oil and you will see that the shiny wear mark is tapered and is narrower as you go left. I figured the black spots were just flotsam and was looking at the witness mark.

For the best FP stop replacement I go with the EGW Oversize part. This is not a drop-in part, however the smithing required is something most of us can do.
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