1911 sear/half cock notch question

[Gunsnrovers]

I have been tinkering on my Springfield GI. Adding and fitting parts, etc.

Today I received a Ed Brown disconnector and EGW sear to add. I had already installed a EMC hammer and new trigger almost two weeks back. Everything had been fitted and worked fine with the original sear and disconnector.

First, I installed the disconnector. It works fine and does it's job.

Sear went in OK and trigger pull was noticably lighter from the get go.

The problem/question I'm having is the sear interface with the half cock notch. The EMC hammer has a captive notch and not the newer relocated shelf. If I cock the hammer and purposfully slip, the hammer falls to the notch and the trigger will not move. If I short cycle the slide, it falls to the notch and the trigger will not move. However, if I slowly draw back the hammer just to half cock engagement, it will often fall if I pull the trigger.

I took the sear and hammer out and fit them outside the frame using some rod I have as subsitute pins. The sear appears to have good engagement on full and half cock.

I just find it odd that I can force a failure (deliberately going to half cock), but the notch functions in the normal operation of the pistol.

Hope I've made myself clearer then mud.

 

[1911Tuner]

Capotive Notch

Quote:

>>If I cock the hammer and purposfully slip, the hammer falls to the notch and the trigger will not move. If I short cycle the slide, it falls to the notch and the trigger will not move. However, if I slowly draw back the hammer just to half cock engagement, it will often fall if I pull the trigger.<<
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Howdy G&R,

When the sear is captive in the notch, the trigger isn't supposed to move...
so that's normal.

By drawing the hammer back slowly...catching the sear in the notch...and having the hammer fall when you pull the trigger is indication that the sear isn't resetting all the way to the bottom of the notch. Maybe because when you draw it slowly, the tip is catching on the edge of the notch and staying there. Try pulling the hammer just slightly past the half-cock and see if it still falls when you pull the trigger. If it functions the way it's supposed to, you've nailed it...and there's not really a problem. If it DOES fall, it's time to look at a few other things.

Standin' by...

 

[Gunsnrovers]

All I can think is that perhaps there was a rough spot on the hammer causing it to catch when I cocked it slowly. I gave it about 200 dryfires (on caps) and I can't get it to repeat the problem at all now. When I draw past the half cock notch, I get 100% engagement.

The trigger is really nice now. I did a little more polishing on the trigger bow so it slides nicer. Very smooth, light, and little take up.

Thanks for your help.

 

[Jim K]

Tuner is right as to the cause of the problem. It was probably due to a small burr or a little rougness on the edge of the half-cock notch catching the sear when you pulled the hammer back very slowly. Your further working it smoothed things up and the problem went away.

Check one thing, though. Remove the sear and hammer again and make sure the sear fits into the half-cock notch properly. I have seen some after-market sears that were too big and split out the half-cock notch if the sear did drop into it. Ideally, the half-cock would not be used to stop the hammer, but it can happen.

Jim