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I'm a semi-newbie to 1911's and don't know about all of the internal workings yet, which is why I'm asking this question here.
I have a Springfield 1911A1 loaded model that has about 500 rounds through it. I noticed that recently there was a small "click" noise occurring while pulling the trigger. It happens just slightly before the breaking point, and with the thumb safety on the trigger can go just far enough that the click will still occur. I'd like to know what's going on here and if it's something that needs to be corrected ASAP. Thanks for your help!
 

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I have a Kimber that does the same thing. I detail striped it and it seems to be comming from the disconnector/sear. I increased the tension of the sear spring leaf and it reduced it a lot. I'm going to take my gun to the smith and have a good old fashioned trigger job done on it.
 

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One of the standard safety function tests is to clear the gun to insure it's empty, cock the gun, place the thumb safety on safe, put the gun close to your ear, pull the trigger, release the trigger, and pull the hammer back very slowly while listening for a click. If you hear it, the safety needs to be refit or replaced as it is not completely blocking the sear from moving out of engagement with the hammer. If the engagement surfaces are less than GI spec, this could result in the gun firing when you thumb the safety off without pulling the trigger.
 

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I had that problem ("disconnector click") after replacing the stock internals of my Colt M1991A1 with Infinity parts. It is caused by the tip of the disconnector moving against the slide as the trigger/sear/disconnector come together. The standard remedy is to slightly deepen the disconnector slot in the slide, so the tip doesn't touch. I did this, and my click is gone.
 

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...and with the thumb safety on the trigger can go just far enough that the click will still occur.
It sounds like both problems from his initial description. One corrected by scraping the disconnector notch, one by refit/replace the thumb safety. One thing I've noticed is the gross variance from spec on the MIM disconnectors that are coming in current Colts. A few under spec, but most with way too much material. Some have been .020" over length & oversize in every other important dimension. Someone who can check that will be able to decide whether to replace the disconnector, spend a lot of time refitting it, or deepening the notch. I don't know about the current Kimbers, Springfields, or others. I usually use a Mil Spec disconnector from my stockpile of new/old stock.
 

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My Infinity disconnector is .010" under minimum, yet when installed was "tall" enough to rub the slide.
 
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