[ARCHIVED THREAD] - New AR Build will not fire... (Page 1 of 3)
Posted: 10/30/2010 5:42:45 PM EDT
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As the title says, I took my new build to the range today but was not able to put a single round down range. I tried Wolf Military Classic, PMC, and Radway Green. After assembling the rifle, it passed a function test. When fired, the hammer falls but does not even leave a primer strike. When dry firing, the hammer drops but does not seem to spring forward with enough energy. This leads me to believe that there is something wrong with the trigger assembly, specifically the hammer spring. The fact that no primer strike is left even after letting the BCG ride home points the the BCG. I tore down and reassembled the BCG as the firing pin did not seem to protrude enough, but this had no affect. All quality components, so I must have assembled something incorrectly. Ideas? Specs: MEGA lower Daniel Defense LPK BCM upper BCM gov profile 1/7 CL bbl 14.5" w/ pinned AAC Blackout Larue BCG |
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Quoted:
Do you have the hammer spring arms resting on the trigger pivot pin? http://i147.photobucket.com/albums/r316/MACDD/FireControlGroupAnimation.jpg This. Or your headspace is WAY off. |
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Quoted: I'm telling you right now I think you're in the wrong forum for this. It might work but it might not. I know I should have posted it in the tech forum, but that does not get much traffic. I'm in a hurry. I gotta get her packed in the Pelican case for a morning flight. I just finished harvest last night and didn't have time to test her out prior. |
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Quoted:
did you assemble the bolt/carrier correctly? try operating the action on the lower without the upper present. You can see if everything is working as it should. then look at the firing pin and make sure you installed the retaining pin correctly. I think you can fuck up the hammer if you're not careful doing this. It goes forward too far and hits where it aught not be hitting. I could be wrong, but I never let the hammer fall freely without the upper installed. |
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Quoted:
Quoted:
I'm telling you right now I think you're in the wrong forum for this. It might work but it might not. I know I should have posted it in the tech forum, but that does not get much traffic. I'm in a hurry. I gotta get her packed in the Pelican case for a morning flight. I just finished harvest last night and didn't have time to test her out prior. OK, just be really careful which posts you listed to... |
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Quoted:
go over to the ar15 section there is a lot of info on them in there, I had issues with one and the guys in there helped me work it out.... my guess is hammer spring is in backwards That's my guess too since everything is supposedly NIB. It's an easy enough mistake to do. The other guess is an out of spec firing pin (or out of spec BCG), weak FCG springs, gritty or malformed FCG pins. |
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Quoted:
did you assemble the bolt/carrier correctly? try operating the action on the lower without the upper present. You can see if everything is working as it should. then look at the firing pin and make sure you installed the retaining pin correctly. Do not let the hammer hit the lower at full power with the upper off. Steel hitting Aluminum is a bad thing. I would ride the hammer forward with your hand if you are going to do this. Go to the tech forums and make sure you put the hammer and trigger springs in properly. There is pics to compare it to. If you did than I would look at your firing pin. Go get another one and see if it is out of spec. They are cheap and you can always use an extra pin. After that it would be a head space problem. Get some gauges. |
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Quoted:
As the title says, I took my new build to the range today but was not able to put a single round down range. I tried Wolf Military Classic, PMC, and Radway Green. After assembling the rifle, it passed a function test. When fired, the hammer falls but does not even leave a primer strike. When dry firing, the hammer drops but does not seem to spring forward with enough energy. This leads me to believe that there is something wrong with the trigger assembly, specifically the hammer spring. The fact that no primer strike is left even after letting the BCG ride home points the the BCG. I tore down and reassembled the BCG as the firing pin did not seem to protrude enough, but this had no affect. All quality components, so I must have assembled something incorrectly. Ideas? Specs: MEGA lower Daniel Defense LPK BCM upper BCM gov profile 1/7 CL bbl 14.5" w/ pinned AAC Blackout Larue BCG [/quote/] Nobody noticed this???? Nobody remembers the shitstorm about Laure BCGs?? Did I just start a shitsorm?? 
ETA Damn it I fucked up the quote.  |
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Quoted: OP have you ever owned an AR before? Yes. I built my first in 2005. I figured I installed the hammer spring incorrectly, but I needed the hive to confirm before I wasted time punching out the fire control group. As stated in an earlier post, I am in a hurry. |
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Quoted:
Quoted:
I'm telling you right now I think you're in the wrong forum for this. It might work but it might not. I know I should have posted it in the tech forum, but that does not get much traffic. I'm in a hurry. I gotta get her packed in the Pelican case for a morning flight. I just finished harvest last night and didn't have time to test her out prior. Just carry it on. It doesn't fire. What's the worst that could happen?
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If it's not the spring, check the BCG, make sure when you assembled it, you hat the firing pin inserted all the way. Something says the cotter pin is in front of the shoulder on the pin and not in the trough that captures the firing pin. Just a thought, I hope it's a quick fix! |