AR Sponsor
Posted: 1/7/2012 10:12:28 AM EDT
|
First scratch build, got Spikes lower enhanced parts kit (NiB trigger, sear, hammer). The first time I used it the trigger wasn't resetting, a quick tap rack and it was back in the game. I got it home and started doing so research and I was able to reproduce the problem, just not as often as when I was shooting live ammo. It appears that the sear is not releasing the hammer off of it's hook 100% of the time. With the upper off, If I move slow enough, I can make the hammer and sear catch on their hooks. Also, for what it's worth, when it is hung, moving the safety to "safe" resets the trigger as that little bit of movement is enough to disengage the hooks.
It does this with the grip on and off, as well as with the grip screw tight and loose. I'm normally pretty good a troubleshooting but I'm not sure now on what should I check or what should my next steps be to fix the issue? Maybe my anti walk pins are too tight? Pictures below. The third picture shows that the FCG is off set on the lower to the right. Again, not sure if this is normal or not but trying to provide all the info I can. 
|
|
Quoted:
Pull the FCG, and check the disco and back of hammer sear edges. Chances are there is an edge bur on both that need to be removed with a stone. Also, before you part the parts back in, CLP lube the piss out of them (pins to channels). Makes perfect sense. I'll look at it tomorrow night. Thanks. |
|
Do you have the stock pistolgrip on the rifle, or have you change to a MagPul or other aftermarket?
When you changed, did you reuse the stock grip screw, or changed to grip screw that was supplied with the new pistol grip? From what I've seen, aftermarket pistol grips are thinner at the top, and require shorter grip screws. If you use the stock grip screw, the screw can be inserted far enough to interfere with trigger, and prevent the gun from firing. |
|
Quoted:
Thanks for the feedback. The ERGO grip came with the LPK. I called spikes, they are sending me a new dis-connector and hammer. They said it can be a problem with the tolerances. Really not seeing that as the problem (so long as you did install the disconnector spring. Uncock the hammer, then without touching the trigger, pull the hammer back past the disco sear, then let it come back up to engauge the trigger front sear. Then hammer rear sear should have a free gap in front of the disco sear by a few thousands, and if such, then you have other problems, such as the KNS pins being too short for the receiver (read when you tightened the side bolts, it now has the trigger binding in the lower, burs as stated on the sear, or just burs on the side C channels/through channels, and not allowing the trigger to move free on the now stationary pins. |
I have almost the same exact problem as the OP. First lower build and the trigger reset is not 100% reliable. 1 out of every 5 to 8 trigger pulls the trigger sticks locked back untill another force is applied. checked all the springs and all seemed good and correct but still does not always reset properly. Mine is all CMMG parts and CMMG lower. Hope you can figure out whats goin on with yours, so i can copy 
Add: Due to my frustration I pulled the trigger out of the lower AGAIN! and I think I have a week trigger spring. Compared the reset strength to my bushmaster lower assembly. The bushmaster reset had a lot more strength to it. Is this reasonable to think? or is this not the issue? |
|
Quoted:
I have almost the same exact problem as the OP. First lower build and the trigger reset is not 100% reliable. 1 out of every 5 to 8 trigger pulls the trigger sticks locked back untill another force is applied. checked all the springs and all seemed good and correct but still does not always reset properly. Mine is all CMMG parts and CMMG lower. Hope you can figure out whats goin on with yours, so i can copy
Add: Due to my frustration I pulled the trigger out of the lower AGAIN! and I think I have a week trigger spring. Compared the reset strength to my bushmaster lower assembly. The bushmaster reset had a lot more strength to it. Is this reasonable to think? or is this not the issue? Dry fit the trigger pin to the trigger and disco out side the rifle. You may have a bur on the side C channels of the trigger that is not allowing the trigger to correctly glide on the pin. Also, don't forget to CLP lube the parts before reassembly the parts back in the receiver. And yes, the pin can be tight to the receiver holes, but the FCG parts should glide/freely rotate on the pins. |
|
I think I have a week trigger spring. Compared the reset strength to my bushmaster lower assembly. The bushmaster reset had a lot more strength to it. Is this reasonable to think? or is this not the issue?
Double check that the hammer spring is installed correctly, with the legs of the springs coming from underneath and resting in the groves on top of the trigger pin. 
|
|
Quoted:
I think I have a week trigger spring. Compared the reset strength to my bushmaster lower assembly. The bushmaster reset had a lot more strength to it. Is this reasonable to think? or is this not the issue?
Double check that the hammer spring is installed correctly, with the legs of the springs coming from underneath and resting in the groves on top of the trigger pin. http://img.photobucket.com/albums/v503/AR15forme/IMG_5660.jpg Yep, thats how I have it. It is better after reinstalling the trigger with some extra oil on the pins. It still feels a little weak but at least not sticking. |
| Funny i'm having this same problem with my spikes battle trigger. Just shot my first build today and I was getting random non-reset's on the trigger. If I flicked the trigger forward with my finger it would reset. It wasn't doing this consistently though. I'll pull it and check for burr's tonight as well. |
|
Quoted:
Funny i'm having this same problem with my spikes battle trigger. Just shot my first build today and I was getting random non-reset's on the trigger. If I flicked the trigger forward with my finger it would reset. It wasn't doing this consistently though. I'll pull it and check for burr's tonight as well. The funny thing is non of us are using the same LPK, (edit: you and the op are using the same kit, my mistake) but all having the same issue. I guess I will have to check for burrs too. Its a pain in the ass to keep pulling the trigger in and out. But any thing is easier than getting that front tack down pin in.... |
| I pulled everything. No burrs or obvious interference issues. The spikes battle trigger is made really well. I cleaned everything and lubed the crap out of it with CLP. I did double check that the spikes pins were installed correctly since they're not identical. Cycled it by hand on the lower and after reassembly and no issues. I have no idea what would be causing it to bind on the reset(it was random though). I'll put a couple hundred more rounds through it in case it just needs a little more break in love. |
|
Quoted:
I pulled everything. No burrs or obvious interference issues. The spikes battle trigger is made really well. I cleaned everything and lubed the crap out of it with CLP. I did double check that the spikes pins were installed correctly since they're not identical. Cycled it by hand on the lower and after reassembly and no issues. I have no idea what would be causing it to bind on the reset(it was random though). I'll put a couple hundred more rounds through it in case it just needs a little more break in love. I haven't had a chance to shoot the new trigger but will this weekend. The new setup does seem to function better so we will see. I'll update after I shoot. |
|
Quoted:
I pulled everything. No burrs or obvious interference issues. The spikes battle trigger is made really well. I cleaned everything and lubed the crap out of it with CLP. I did double check that the spikes pins were installed correctly since they're not identical. Cycled it by hand on the lower and after reassembly and no issues. I have no idea what would be causing it to bind on the reset(it was random though). I'll put a couple hundred more rounds through it in case it just needs a little more break in love. Update: Fired a few hundred more rounds, mostly M855 with 0 malfunctions this afternoon. I'm thinking I just didn't lubricate the trigger group assemblies properly during the initial build and there was some binding. |
AR Sponsor