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Posted: 7/30/2009 2:20:30 PM EDT
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When I pull the trigger the hammer falls but when I keep holding the trigger, pull the charging handle and slowly release the trigger the hammer still falls.
It only does this when the rifle is together. If I take the upper off, the hammer does not fall. |
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So you're saying that the rifle fails the function check when it's assembled, but if you do the function check with just the lower by manually cocking the hammer that it passes?
If that's the case, can you retract the bolt and engage the bolt catch? My suspicion might be that you have a rifle buffer in a carbine tube or something like that and the B/BC isn't coming back far enough. That's not it because if it was, it wouldn't cock the hammer to begin with. |
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Quoted:
When I pull the trigger the hammer falls but when I keep holding the trigger, pull the charging handle and slowly release the trigger the hammer still falls. It only does this when the rifle is together. If I take the upper off, the hammer does not fall. Quick release the trigger and see if the hammer still passes the trigger sear and goes all the way forward against the FP. Could be that you are releasing the trigger in a way that when you get to the point that the hammer is released from the disco, you are slowly pulling back on the trigger so the hammer misses the trigger sear. If this is not the case, and the disco spring is installed large coil side down into the back of the trigger slot, time to check the free gap on the disco. With the upper shotgunned open and the trigger not touched, pull the hammer back until the rear hammer sear and the disco sears are as close as you can get them together. The free gap between the two sears should be in the .001 to .003 range, and if the gap is much wider that this, then the disco is out of tune. Solution would be to either get a replacement FCG for the one out of tune, or retime the sear if the problem lies in the receiver FCG holes being slightly out of spec. |
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Quoted:
When I pull the trigger the hammer falls but when I keep holding the trigger, pull the charging handle and slowly release the trigger the hammer still falls. It only does this when the rifle is together. If I take the upper off, the hammer does not fall. Quick release the trigger and see if the hammer still passes the trigger sear and goes all the way forward against the FP. Could be that you are releasing the trigger in a way that when you get to the point that the hammer is released from the disco, you are slowly pulling back on the trigger so the hammer misses the trigger sear. . I just tried quick releasing the trigger and the hammer does not fall. Is it a problem that it falls when I release the trigger slowly? |
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When I pull the trigger the hammer falls but when I keep holding the trigger, pull the charging handle and slowly release the trigger the hammer still falls. It only does this when the rifle is together. If I take the upper off, the hammer does not fall. Quick release the trigger and see if the hammer still passes the trigger sear and goes all the way forward against the FP. Could be that you are releasing the trigger in a way that when you get to the point that the hammer is released from the disco, you are slowly pulling back on the trigger so the hammer misses the trigger sear. . I just tried quick releasing the trigger and the hammer does not fall. Is it a problem that it falls when I release the trigger slowly? Yes. That means the trigger sear is not catching the hammer after it slips off the disconnector. Either the sear surfaces are out of spec or the pin holes are. |
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When I pull the trigger the hammer falls but when I keep holding the trigger, pull the charging handle and slowly release the trigger the hammer still falls. It only does this when the rifle is together. If I take the upper off, the hammer does not fall. Quick release the trigger and see if the hammer still passes the trigger sear and goes all the way forward against the FP. Could be that you are releasing the trigger in a way that when you get to the point that the hammer is released from the disco, you are slowly pulling back on the trigger so the hammer misses the trigger sear. . I just tried quick releasing the trigger and the hammer does not fall. Is it a problem that it falls when I release the trigger slowly? Yes. That means the trigger sear is not catching the hammer after it slips off the disconnector. Either the sear surfaces are out of spec or the pin holes are. but why does it only do it when the upper is on. If it was a problem with the trigger you would think it would do it when the upper is off too |
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Ok well after playing around with it some more it looks like the upper has nothing to do with it and it was just the way i was holding it.
If i put some pressure on the side of the trigger while i release it, the hammer does not fall. So i guess the pins or holes are out of spec, the pins do not move side to side but they do rotate when i pull the trigger. |
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another update:
Man this really doesn't make any sense. Ok when the upper is off it does not matter how i pull or release the trigger, it works fine every time. When the upper is on, the second part of the Fire function check fails every time unless I put pressure on the side of the trigger while i release it. I was planning on going to the range tomorrow, would it be safe to go or will this cause double fires? |
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If you do clean/quick releases of the trigger you should be fine for now, but the FCG does need to be corrected since you may offer to let someone else shoot the rifle, and if they release the trigger slowly, chances are they will have the rifle fire on trigger release.
Also, what Free gap does the back sear of the hammer have now against the disco when the trigger is not touched (hammer lowered back/down until the two are as close as they will come together)? The reason that I ask is re-timing the disco in not as hard as it sounds. To time the disco/close the free gap to the correct dimension, you just remove metal from the bottom/front of the disco, where it seats/maxes out forward against the top/front of the trigger. |
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