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Posted: 8/18/2013 8:11:02 AM EDT
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My college buddy came over night before last and brought over his AR15.
He built it himself, and it looks surprisingly nice. Originally it wasn't cycling, so he made some adjustments and we took it to the range the next day. Now it is cycling, but the trigger is not resetting. The hammer does cock during cycling, but it seems that the disco is getting hung up. Thoughts? I'd just tear down the trigger assembly and completely reinstall it, but he doesn't seem to want to do that. 
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Quoted:
My first thoughts would be either the hammer or disconnector spring are installed incorrect? I installed the hammer spring wrong on my first build and it gave me similar problems. This is what I am thinking. I am gonna send him a link to this thread in a bit. |
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If you hold the trigger back, charge the weapon, and when you go to release the trigger for the disco to drop the hammer to be retained by the hammer nothing happens, or you have to use the selector for the disco to release the hammer,
The then first step is to make sure all the springs where installed correctly, the disco spring was installed large coil side downward into the trigger slot below the disco, all the springs installed correctly, and all the parts, including the pins where CLP lubed before installed 
If he is good so far, then problem is most likely that the disco/back trigger sears, or even the side C channel of the trigger has burs and not allowing the hammer sear to cleanly release from the disco, or the trigger to clean return to the home position on it's own. 
Short of these problems, then it just comes down to looking at the tail of the hammer to confirm that its not binding on the sides of the U channel in the selector, or even the trigger shoe binding on the channel for it in the lower receiver. |
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Quoted:
Not questioning your assessment, but curious. How would an upside down disconnector spring cause this? Quoted:
Quoted:
Something tells me he installed the disco spring upside down. Not questioning your assessment, but curious. How would an upside down disconnector spring cause this? Something is causing the disconnector to fuck up...just a guess. Here is what is happening. He fires. Hammer recocks. He goes to pull the trigger again, there is some play, but no click/bang. If I hold down the trigger and charge the rifle (without a round in the chamber) then release the trigger and try to dry fire, same thing happens. |
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Again, see my post above, since if the moving the selector from fire to safe, and back again to fire gets the hammer released from the disco, then I have already covered the correction of such in the above post.
As for the disco installed up side down, The bottom larger coils gets wedged into the trigger slot so it down not fall out, hence leaving the smaller side upwards to move freely, and if the spring is installed large coil side up, the disco tail being cam'd down just wedges the spring into the slot to bind it up all the way inward with the disco now loose in the trigger. |
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