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Posted: 5/10/2016 7:06:33 PM EDT
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So I went to zero my psa build with cmmg lower parts kit. Normally dry firing the trigger is light no take up no over travel.
So when pressing trigger to the rear it was really heavy, not a problem. Then after I fire 2-3 rounds the trigger wont move and the gun won't fire.it's seems like the safety is on but the selector is switch is on fire. I don't know if this is trigger related problem or the safety. |
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I had 2 builds earlier this year where the rear part of the trigger that goes into the notch in the safety was instead contacting the solid part of the safety. One I hit on the grinder, one I used the mill, but had to take a little off of the passenger side of the trigger. I've seen some machined in that area, others raw cast. I don't remember the brand of the LPK, probably PSA, Aero, CMMG or Spike's as those are all I remember purchasing recently.
I don't know if the problem was with the LPK or the lowers, but the fix was easy so I didn't get too concerned. Good luck and let us know what you find. |
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Quoted:
Ok so I just got home tried to dry fire the weapon, nothing? So I then took apart the pistol grip and saftey. It will fire so do you think I should rule out the trigger or its components as the culprit? You didn't get a hold of a grip screw that is to long did you? I have had that happen and keep the trigger from working correctly. |
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So I been racking my brain tryning figure out how to replicate what happened yesterday while shooting. I think I may have found the issue but need advise on correcting it. It seams after firing a round the bcg goes to the rear extracts cartridge. Then after the bolt cycles a fresh round in the chamber it goes forward but barely not enough to go into battary. So what I did was rack charging handle and let it go slowly to wear it's barley out of battary, same exact issue it's seams like to me. Tell me what you guys think and thank you to everyone for the suggestions and advise so far I really apppreciate it.
Edit: after trying this multiple times the Tigger issue I could only get to happen twice. Every other time the trigger would still release. |
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Trigger and hammer springs are on correctly.
Is your disconnector spring upside down? The fat end goes down and I see a bit of it peeking out from the side of the disconnector. What brand lower? It may be the pics, but it looks like the hammer and trigger pins aren't absolutely perpendicular to the sides of the lower. Do you have another safety selector to swap in there to test? |
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Psa lower, cmmg lower parts kits. I do not have another saftey selector to swap In this is my only rifle. Also when I took all parts out last night I took the disconector out and looked the wider side down. I'll take it out and look again. Thanks again for all the help the problem is probably something really stupid and simple I just can't see it. I will say I bought the cmmg lower parts kit from cabelas and it's was the last one and its had tape covering it like it was opened but then returned(I did make sure all the parts where in there) so maybe some asshole bought it and used it swap out some of his defective parts and took it back and now I'm the lucky owner lol.
http://rs1268.pbsrc.com/albums/jj578/Mason091/Mobile%20Uploads/20160511_165931_zpsafiktha0.jpg?w=480&h=480&fit=clip http://rs1268.pbsrc.com/albums/jj578/Mason091/Mobile%20Uploads/20160511_171706_zpssxju5gkv.jpg?w=480&h=480&fit=clip |
| Can someone answer this question for me. I think I have a bad disconector or spring. Now I read some where to take a pen or pencil and push down on the disconector and spring while the hammer is cocked if it releases it's fine if not its a bad disco spring. My would not release the hammer, could some answer if there is any validity to this test if so I think I may have solved it thanks. |
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I'm almost certain I didn't would the bolt catch still function with a disco spring installed. The reason being cmmg color codes there bags saying whats in what bags as you go threw the steps. I'm ordering all new trigger group springs from psa including disconector and new saftey with springs and dentent.
Edit: before I order tomarrow I will take the lower apart once more and look, I'll up load a pic sometime tomarrow afternoon of what may or may not be a disconector spring. so maybe you or someone else can let me know for sure if I put the wrong spring in thank you for your time and advice. |
| Have you tried pulling the trigger without the upper on it? You'd need to either put your hand or a rag wrapped tightly in front of the hammer so it doesn't slam into the lower. That would let you see what's going on. If it did have something to do with not going fully into battery then this would definitely tell you that too. |
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Quoted:
I had 2 builds earlier this year where the rear part of the trigger that goes into the notch in the safety was instead contacting the solid part of the safety. One I hit on the grinder, one I used the mill, but had to take a little off of the passenger side of the trigger. I've seen some machined in that area, others raw cast. I don't remember the brand of the LPK, probably PSA, Aero, CMMG or Spike's as those are all I remember purchasing recently. I don't know if the problem was with the LPK or the lowers, but the fix was easy so I didn't get too concerned. Good luck and let us know what you find. What he said about the safety and read part of the trigger. |
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Yes I have taken the upper off it functions just fine with a nice audible reset. But when I got to fire live rounds the trigger is so hard to pull on some not all shots that I litterly had my whole finger in the trigger gaurd and the trigger would not budge.
- so basically remove a little material from the right side of the trigger on the back. When everything is in the receiver it looks like it's riding inside the notch and not hung up. |
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Disconector spring: http://rs1268.pbsrc.com/albums/jj578/Mason091/Mobile%20Uploads/20160512_164949_zpsexdt0brx.jpg?w=480&h=480&fit=clip
Trigger and safty on fire http://rs1268.pbsrc.com/albums/jj578/Mason091/Mobile%20Uploads/20160512_165347_zps3u3pqign.jpg?w=480&h=480&fit=clip |
| I am not sure, but it looks like that lower is not machined deep enough where the grip screw comes through, I know on all of my guns, the FCG pocket is even all the way back to the shelf? Perhaps it is an optical illusion, but it does not look like it was fully machined to me, if it is not, that may be causing the trigger tail to hang. Do you have the ability to measure the depth in that area? |
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It works fine with both on and off. It's weird I don't know how to explain it could be a bunch of diffrent things. But when I fired live ammo after a couple of rounds the trigger would not release. Once or twice I could get it to fire by Appling a ridiculous amount of force to the trigger but then then next couple rounds it would fire fine then back to not releasing. It is trigger rest issue or a selector issue. But after reading everyone post I don't even know where re to start thanks again for the help. Also to the guy saying my reciver might be out of spec I have a few more photos of where the grip screws into the reciver. Could you up load a picture of what it should look like thanks.
- when I said my bolt not going into battary on the range it seamed like it was. But at home I was tryna replicate the issue by doing a functions check but instead of letting the bolt slam home I road it forward seeing how it would affect the trigger. I did get it to do what it did one the range once, but I could not again do it again. Sorry if I seam all over the place with what it could be I'm just frustrated at this point and have no clue where to begin to fix it. |
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Quoted:
I am not sure, but it looks like that lower is not machined deep enough where the grip screw comes through, I know on all of my guns, the FCG pocket is even all the way back to the shelf? Perhaps it is an optical illusion, but it does not look like it was fully machined to me, if it is not, that may be causing the trigger tail to hang. Do you have the ability to measure the depth in that area? http://rs1268.pbsrc.com/albums/jj578/Mason091/Mobile%20Uploads/20160513_042430_zps7ialjaii.jpg?w=480&h=480&fit=clip http://rs1268.pbsrc.com/albums/jj578/Mason091/Mobile%20Uploads/20160513_043408_zpsnux6nwjl.jpg?w=480&h=480&fit=clip It is even all the way back, I see what you mean on the other pic. I may have taken the photo at an odd angle I uploaded 2 more let me know what you think just in case. There is a tool mark or semi circular line at the end where the fire control group sits right before the grip screw. Thanks |
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