AR Sponsor
Posted: 12/1/2014 7:28:32 PM EDT
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First post here, so a little introduction. I am a hobbyist/target shooter from Texas and have been shooting since I was about 10 and have recently started to amass a small collection of my own. New-ish to the AR platform as in I have owned mine for about 3 years and done little more than slap a scope on it and do routine cleanings.
Recently I have been experiencing double fire, I pull the trigger once and two shots fire. There are a couple variables/ob at play here: 1) New Ammo. This is my first time using UMC 55g .223 ammunition. 2) I performed the disconnector timing test I read in a few posts on this forum. I pull the trigger back, pull the charge handle, and slowly release the trigger. In my case the hammer DOES fall while releasing forward, which I believe might indicate a bad disconnector. 3) The attached photo shows a pin right above my trigger that is out of place (photo attached). Can't seem to realign this pin externally. Have never detached or gotten up close and personal with the lower/trigger of my rifle aside from cleaning/lubing. I assume this is the most likely cause for my double fire problem, and at very least needs to be fixed. Can somebody link me/advise me here on what steps should be taken to realign this pin? 
Thanks and glad to be here. |
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Quoted:
Take off upper. Use the hammer to move the trigger till its aligned and push pin back into hole. Then go buy yourself some KNS anti rotational screws. Around 20-30 dollars. Follow directions on package or use YouTube to see how they are installed! Good luck. Done and issue solved. Thanks!! |
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KNS pins aren't needed. The spring arm thingies should sit on top of the pins in the little notches that keep them from walking out. I had an AR burst fire on me once, and I noticed that the springs were under the pins causing my pins to walk and my gun to shoot multiple times with one press of the trigger every so often. Reinstalled the FCG correctly and the problem went away. Get new pins and ensure that your FCG is installed correctly. |
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Quoted:
So, based on this troubleshooting, one of the pins is out of spec and not true, causing an out of tolerance condition on the FCG sears? Thanks in advance... I had the same symptom with a broken hammer pin. It started to double and one day it dumped the whole mag.......right up until the pin fully sheared off. My rifle was a club until I got another pin. Spare parts is good. 
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Quoted:
Might sound weird, but a drop of superglue around one side of the pin will do the trick. I've done this on a couple that acted like they wanted to shift. The pins should be allowed to settle at the very least prior to this maneuver. Never even contemplated this so I don't know how it would work but just to throw it out there... i'm not endorsing this haha. |
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Quoted:
Take off upper. Use the hammer to move the trigger till its aligned and push pin back into hole. Then go buy yourself some KNS anti rotational screws. Around 20-30 dollars. Follow directions on package or use YouTube to see how they are installed! Good luck. And you will still have the issue that allowed this pin to move. KNS pins only fix symptoms, not problems. There are untold millions of semi and full auto ARs in the world that have been functioning fine for more than 50 years without KNS pins. Fix the issue, not the symptom. In this case, since it is the trigger pin that has slipped, it is probably the hammer spring being installed incorrectly. Either it is on backwards or the legs are positioned incorrectly. The fix is free, just assemble your upper properly. |
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Quoted:
Might sound weird, but a drop of superglue around one side of the pin will do the trick. I've done this on a couple that acted like they wanted to shift. Super glue is not required to properly assemble or service an AR15 and is not the fix for this issue. |
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Super glue is not required to properly assemble or service an AR15 and is not the fix for this issue. Quoted:
Quoted:
Might sound weird, but a drop of superglue around one side of the pin will do the trick. I've done this on a couple that acted like they wanted to shift. Super glue is not required to properly assemble or service an AR15 and is not the fix for this issue. Hey, to each his own. I'm just saying it worked for me. Not saying it's for everybody. Just my experience. My opinion, beliefs, or posts are my own. Do with it what you will. Never had a pin walk completely out anyway as like previous posts have said, the spring ends go into the pins and the j spring in hammer keeps it from moving. |
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