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Posted: 11/19/2007 4:30:17 PM EDT
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Well I finished my first build the other day and took it out to my farm (thank goodness) to sight it in. When I pulled the trigger I popped off 3 rounds. It will only fire auto. What is USUALLY the culprit when this happens? Im geussing I might have installed the trigger/hammer wrong. Does that sound likely? Thanks |
Oh yeah, I know. I only shot a few rounds tinkering between each shot to see if I could fix it. No dice. I bet I installed the disco spring wrong. I'll check it tommorow. |
(There are other versions of this that you do with the rifle fully assembled, but the way I describe lets you see what's happening.) |
Thank you very much! I just broke it down and when I popped the trigger group out the problem was revealed. Somehow, someway that disconnector spring had become disfigured. It was bent/smushed to the side. I certainly remember it being intact when I assembeld the lower. Not really sure what happened, but I basically had no disco spring. Thanks for all the help guys! |
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You're having a problem with your FCG. Do the test as said above. DO NOT shoot your rifle until you get it figured out. First off if you were to get caught it could mean trouble for you, even if you didn't mean to. LE would love to find someone with an illegal MG. Secondly what is most likely happening; the hammer is following the bcg home and you COULD have a round fire out of battery (the hammer hits the firing pin before the bolt is locked), which would lead to a kaboom. nm - you got it fixed. |
| i had a buddy that was all excited about how he could simply remove the disco spring in case of SHTF/ marshal law... i admit it sounded interesting, but i knew the law was against it, so i looked around.. until i learned about what would happen if the hammer followed before the bolt locked up... he gave up on that idea... might be fun if it accidentally happens, but the silver hook up or KB isn't worth it. glad you got it fixed. enjoy your new build! |
like witchcraft 
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The fun part is holding on until the mag empties itself. First function firing tests should be done with a less-than-full mag for just this reason. |
If it were legal....
A rather broad brush don't you think? Perhaps some desk fed. I don't know anyone I work with that would go looking for this. I'm sure there may be some in my dept that would, but I don't know them. And it's not because they are LE that they are A-holes.....they were A-holes long before they became LE EDIT: For those that think this is an easy way to go FA just remember that there is a possibility for a primer strike before the bolt is fully locked.....which could cause a KB |
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Do not play games with ideas of screwing with your FCG. Club Fed is not the place for a recreational shooter to end up spending 15 years. It is likely your disconnector is not engaging the back of the hammer. Missing/wrong spring is the likely culprit. If that's not it, have someone with an AR look at it for you, they can probably spot the problem & fix it for you. |
I'm not saying that all LE would get up in a tizzy however I would say the general LE would wet their pants if they saw an illegal MG. Case in point in this thread the op is getting bent over by the LE/BATFE for loaning out an AR-15 and the person whom he loaned it to changed out the FCG to an M16 FCG, causing the hammer to follow the bcg and slamfire. Read the thread. LE test fired the AR and it supposedly caused the weapon to fire FA. Then the BATFE expert examined the weapon and concluded, in writing, that the weapon WAS NOT an illegal MG however the BATFE will won't drop the case.  . |
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