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Posted: 9/12/2017 9:25:06 PM EDT
[#1]
I am sure you checked this, but is your hammer spring in the right way?
if not that, look at the trigger, I would examine sear surfaces, and see if you can manually replicate the problem. what type of trigger, buffer spring, and buffer are you running? Also, what kind off ammo? if el cheap euro stuff you may want to clean your gas system extra thoroughly.... mine builds up crap in the tube from wolf..... although it typically just blows through and makes the BCG/lower a mess...... |
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Posted: 9/13/2017 12:15:40 AM EDT
[#2]
Are you getting enough gas to lock the bolt the mag when the last round is fired.
Sounds like the bolt is not traveling back far enough to cock the hammer. |
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Posted: 9/13/2017 12:35:53 PM EDT
[#3]
Hammer spring is installed correctly according to a couple of Factory rifles I have and all online references. Gas tube is clean and free of debris and residue. It is getting enough gas to lock open on an empty mag everytime.
The bolt only has to come back 1.508 to cock the hammer and it has to continue back to 2.206 to lock back on an empty mag on my rifle. Could the hammer be bouncing when it gets to it's full rotation and not getting caught on the sear/trigger? The engagement surfaces look fine to me with no chipping, galling or anything out of the ordinary. The lower parts kit is an Anderson kit so I'm not sure where the parts in it came from. Steve.......... |
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Posted: 9/13/2017 6:56:16 PM EDT
[#4]
Has your gas block moved at all or is there a lot of blow by around the tube or block?
What's puzzling is it ran fine for a while, now it won't. Are you using a rifle stock or carbine buffer and tube? Using an A2 stock screw in a CavArms or G.I. Vietnam era stock will cause this problem. |
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Posted: 9/13/2017 7:45:00 PM EDT
[#5]
It's an Anderson lower with a 6 position adjustable stock, gas block hasn't moved a bit and the gas tube is still in it's place (16 inch barrel, carbine buffer/spring, gas tube). The fact that it ran fine for a while and then started this would signify something has changed but as far as measurements go everything is still the same. I swear I'm not making this up.
What seems strange to me is that the bolt will come all the way to lock back or pick up the top round in the magazine which is past the point where the trigger/hammer is reset but it doesn't cock the hammer. Steve......... |
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Posted: 9/14/2017 3:06:17 PM EDT
[#6]
If the bolt came back far enough to grab a round out of the mag via the back rim, then it came back far enough to cock the hammer back.
Pull the FCG to make sure that you have installed the Disco spring, the disco is not binding on either the trigger pin or channel, and that you have the correct Free gap between the disco sear to the back hammer sear when you cock the hammer back by hand without touching the trigger. The correct free gap that the hammer rear sear should pass the disco sear with the trigger untouched, is .001" to .003" (thickness of a human hair). If the free gap between the two is larger than this, then you may need to retime the Disco to close the free gap spacing. |
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Posted: 9/15/2017 3:48:23 PM EDT
[#7]
Thanks for the advice Dano, it looks to be within the spec's you gave. Like I said before it mystifies me that it can strip the top round out of the mag but the trigger isn't resetting. When I cycle it manually it resets everytime.
Can it possibly be cycling too fast to reset the trigger or something dealing with that? Steve.......... |
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Posted: 10/3/2017 5:25:57 PM EDT
[#8]
What buffer weight are you using?
Maybe try heavier. I'm using an H3 in my X39 |
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Posted: 10/4/2017 1:22:41 AM EDT
[#9]
Quote HistoryQuoted:
Thanks for the advice Dano, it looks to be within the spec's you gave. Like I said before it mystifies me that it can strip the top round out of the mag but the trigger isn't resetting. When I cycle it manually it resets everytime. Can it possibly be cycling too fast to reset the trigger or something dealing with that? Steve.......... Really, just pull the FCG to give it a good cleaning, look at the sears and springs, and to make sure that you don't have a piece of debris under the trigger causing problems. As for when you put the parts back in, Large coil side of the disco spring goes down into the trigger slot with the top narrow side towards the bottom of the disco, and make sure that your hammer spring is orientated correctly as well (spring legs should be coming out the bottom and back over the top of the trigger pin). |
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Posted: 10/4/2017 10:40:32 PM EDT
[#10]
I'm using a standard Carbine buffer. I'm going to dig through my stuff and see where my H3 buffer is.
I took the fcg out and made sure everything was clean and assembled it like my factory Rock River Arms rifle was put together (same as I had originally assembled it), now to find some range time. Steve....... |
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