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Posted: 2/7/2008 6:40:37 PM EDT
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I have seen it posted that you should replace your disconnector at 5000rds. I have several ARs and don't know how many rounds I have fired with the lowers. How would I know when its time to change the disconnector? What exactly does the disconnector do anyway? |
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Granted that a rifle should be serviced (checked) at that mark, it's not common to have to change out a disco (or any other part) at that time. For the most part, unless the sears have worn or cracked, then the FCG parts are just checked for timing issues. In regards to the disco, it retains the hammer back until (in the case a semi auto weapon) the trigger is released. In regards to it's timing, this can be checked either free gap or just the amount that the trigger needs to return back to it's at rest position before it release the hammer for the trigger primary sear to catch it. For checking free gap, with the trigger at rest, pull back on the hammer until the rear hammer sear (secondary) is as close to the disco sear as possible. The gap/space between the two sears should be in the .003 range or less. In regards to trigger return testing, here with the rifle together and unloaded, hold the trigger back and cock the hammer back via the charging handle. Now while still holding the trigger back during the CH charge, slowly release the trigger. The disco should release the hammer just before the trigger get all the way forward to it's at rest position (read the trigger being forward in the correct position for it's primary sear to catch the hammer. |
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I just say your IM; is the trigger/FCG in question a standard or a 2 stage match type? As long as all the parts have been installed correctly and the sears are in good working order, the it may boil down to retiming the disco/FCG for the lower at hand. On a standard FCG, this is done by removing metal for the front bottom of the disco where it limits out forward on the top/front of the trigger. By removing metal here, it allows the disco to cam more forward, hence have better retention of the hammer, and releases it later in the trigger forward movement. Again, .003 or less is the good distance for the free gap (the amount of space as you cock the hammer back by hand that the disco and trigger secondary sears will miss each other). If you have a two stage NM trigger, the it gets a little more complicated since adjusting the sear more forward will increase the second stage set point as well. If this is the case, then you either need to send the parts back, or find a smith to reset the disco. |
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