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Posted: 2/27/2010 9:10:35 PM EDT
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Hey guys,
So today we had the chance to take out a new AR build my cousin had finished. The first 2-3 mags ran no problem using regular Federal .223 55gr. However at the third run we had a "unusually rapid" discharge occur. 
So figuring it was me holding the rifle like a wimp or accidentally bumped it I gave it another go... And it happened again! And this time with a double feed that jammed it up and mangled the 2 rounds that were trying to load. So at this point we're freaking out (we dont want anything happening to our dogs...) and I look the rifle over. It is then I notice that the trigger pin has worked itself out from one side causing the trigger itself to be kinda floppy and loose in the lower. I then pushed the pin back in and ran another mag with no further issues. So My questions are: - Could the loose trigger have been the cause of the "unusual" incident? -The rifle is VERY light; Could that have made me bump it? -Should he change out the pins and fcg? Keep in mind It only happened after the first couple of mags (when at that point the pin may have worked loose) and stopped once I pushed the pin back into place with no further incidents. We just want a little peace of mind, since it was completely unexpected and were not sure what exactly caused it. Any help would be tremendously appreciated.... Thanks, Luis |
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The Trigger pin is held in place by the leg of the hammer spring going in the notch of the trigger pin. My guess is you didn't get the hammer spring leg to drop into that notch when you installed it. When I install it I check it visually and then take a punch and give a nudge on the hammer and the trigger pin to see if they move. They are either locked in place that it would take a good hard push with a punch or they slide out pretty freely.
Also the Disconnector. Make sure the little spring is seated with the wide part of the spring in the bottom of the trigger and make sure the base of that spring is sitting flat. Make sure the trigger pin goes through the trigger and the Disconnector. I put one in last week with a "Slave" pin and it made the job alot easier. In case you are wondering the the hammer has alittle wire/ spring on the center of it's hole that engages the center notch of the hammer pin. After doing all this safety check. Make sure the gun is unloaded. Take out the mag and cycle the bolt and pull the trigger. Then hold the trigger back cycle the bolt and then release the trigger and you should hear a "Click". That's the Disconnector working. The the trigger can now be pulled and the hammer will drop. Check the safety to make sure that the trigger can't be pulled with the hammer cocked. Do all these checks a few times and then off to the range. Load one round in the mag and fire. Bolt should lock back. If it doesn't you have a gas problem. Do this a few times then for the next few mags load like three rounds in the mag and fire. If the gun fires all three rounds and the bolt locks back at the end of the mag, you are good to go. |
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Thanks you guys! we were pretty startled when it happened. We will make those fixes you suggested T-Tac. Hopefully that remedies the problem. However what did you mean by the rifle having a gas problem? Could that also be responsible for what happened? Im pretty sure it was the pin since once corrected it didnt happen but im just curious what you mean.
Thanks Again! Luis |
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Quoted:
Thanks you guys! we were pretty startled when it happened. We will make those fixes you suggested T-Tac. Hopefully that remedies the problem. However what did you mean by the rifle having a gas problem? Could that also be responsible for what happened? Im pretty sure it was the pin since once corrected it didnt happen but im just curious what you mean. Thanks Again! Luis He was just giving you the finishing procedure for Ops checking your rifle. A rifle that is under gassed (or using weak ammo) will not move the Bolt Carrier Group (BCG) back far enough to lock it open after last round in mag is fired. This would have nothing to do with your "doubling/multiples" problem. 
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