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Posted: 9/17/2013 5:58:34 PM EDT
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I am in the process of installing a palmetto state armory lower parts kit in an Aero Precision lower reciever and ran into a problem with the trigger group. When i cock the hammer by hand with the trigger pulled, so that the disconector catches the hammer, then release the trigger, the disconector does not release. If i push the trigger forwqard a little it will release and "hand off" the hammer to the trigger. none of the other lowers i have assembled have had this problem. Should i compelte the assembly and shoot it to see if it is a problem while shooting, or contact PSA? Any suggestions would help. Thanks
Also, This is the PSA LPK, not the cheap P-tac kits. |
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Quoted: My first build I ever did was a PSA Lpk into a franklin armory lower. I had the same problem you described until I realized that you need to function check the trigger with the safety I stalled. Are you testing the trigger with the safety installed? ^^^^^^^ THIS
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I have a PSA trigger group in an Aero lower and it works great. It's actually pretty smooth for a GI trigger.
I grease the bearing surfaces real good when I install a trigger. Maybe a little grease would help butter things up. (That and making the sure the safety selector is installed like said above.) Also, triggers will burnish and work a little smoother with use. |
| i did install the safety, without the detent though, to initially test the trigger. I greased the trigger and hammer pin holes, and all contacting surfaces before i assembled them. When i compare this disconector to the one that came with my spike's enhanced LPK, the nub that catches the hammer looks much larger on the PSA one. I contact palmetto and am awaiting a response from them to see if i should leave it alone and try it, or replace the disconnector. Thanks for the suggestions. |
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I had a Psa kit where I had to push the trigger forward to get it to reset fully. I think we had the same issue. I ended up sanding the area on the hammer that catches the disconnector and the actual disconnector face too. I went incrementally and just made it shiny and smooth with some very fine sandpaper. I found it released freely after just a little smoothing out and applied slp2k grease to both faces. Test firing was fine. If you want pictures I'd be happy to post them for you tomorrow when I'm home from work.
It seems like the finish was just a bit too course to let the disconnector pass of the hammer on my kit. Now the trigger resets perfectly. |
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Thanks for the information. I might try to do the same with this disconector and hammer.
I recieved a response from PSA saying that they have seen this problem several times and that it is out of spec. They offered to supply a shipping label then replace the items once they recieve and inspect them. I am going to try to polish the contacting surfaces first because i don't really want to deal with the pain in the a$$ of shipping it back. |
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Quoted:
Thanks for the information. I might try to do the same with this disconector and hammer. I recieved a response from PSA saying that they have seen this problem several times and that it is out of spec. They offered to supply a shipping label then replace the items once they recieve and inspect them. I am going to try to polish the contacting surfaces first because i don't really want to deal with the pain in the a$$ of shipping it back. I'm a self taught tinkerer. If I can figure it out, you sure as hell can. |
| Similar issue with the PSA lower kit I installed in a blem PSA lower on Monday. Did my usual dress and polish to the trigger and hammer and was disappointed in how it felt. It did not feel like all my other PSA triggers (awesome!). It felt almost like a two-stage in that it had a bad hitch, like a junk, gritty trigger. Took it apart and spent a little more time polishing and upon reassembly it still had the issue. Got to looking at it, and if you pushed the hammer back to cock it, it would hit the disconnector. After the hammer was cocked, you can normally, or should normally, be able to move the hammer back and forth past the disconnector without it touching. Mine was touching. I verified what I found with my other ARs and they were fine. Pulled some of my extra FCGs and compared disconnectors and even installed one of them. The top hook was too far forward on the new PSA unit. Dressed it back until it cleared and everything felt like it should. |
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I havn't had a chance to do anything with this since for a few days, but i will tonight after work. The feel of the trigger once it is reset actually feels decent, so once the disconnector problem is fixed it should be fine. I already fully threaded the drip bolt hole so i can use a set screw to take up some of the initial travel in the trigger. I've done that on one of my other builds and was happy wqith the improvement for the minimal amount of work required.
I do appreaciate the responses so at least i know i'm not the only one with this issue, and PSA has a problem with thier current FCG's. |
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I have yet to fire my PSA build, but I don't really follow the function check you are doing. Perhaps this will show my ignorance when it comes to these rifles, but if you cock the hammer with the trigger pulled, then release the trigger, why would you expect the hammer to release? The hammer would release when you pull the trigger, not when it is set.
More than likely I am misunderstanding the problem. Having said that, the function tests I ran on my blem PSA lower and PSA LPK were good. I had the lower fully installed with all detents when performing the basic function tests. This is the first I have read of the one you describe, though it appears a common test. For what it is worth, my trigger feels as good or better than all of the off the rack rifles I have messed with at shops. Also, I must be even lazier than all of you guys because putting a padded envelope in the mail seems way easier than hopefully fixing a problem that may not then be covered under warranty replacement since it was altered if it proves not to fix your issue. PSA has had great CS as far as I have been concerend with them (almost my entire build). |
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Quoted:
I have yet to fire my PSA build, but I don't really follow the function check you are doing. Perhaps this will show my ignorance when it comes to these rifles, but if you cock the hammer with the trigger pulled, then release the trigger, why would you expect the hammer to release? The hammer would release when you pull the trigger, not when it is set. More than likely I am misunderstanding the problem. Having said that, the function tests I ran on my blem PSA lower and PSA LPK were good. I had the lower fully installed with all detents when performing the basic function tests. This is the first I have read of the one you describe, though it appears a common test. For what it is worth, my trigger feels as good or better than all of the off the rack rifles I have messed with at shops. Also, I must be even lazier than all of you guys because putting a padded envelope in the mail seems way easier than hopefully fixing a problem that may not then be covered under warranty replacement since it was altered if it proves not to fix your issue. PSA has had great CS as far as I have been concerend with them (almost my entire build). The hammer isn't supposed to release and fully rotate when you release the trigger. When the trigger is held down and the hammer is cocked, the hammer is caught by the disconnector, not the trigger. This prevents the hammer from hitting the firing pin after the BCG cycles if you still have the trigger held down. Once you release the trigger the disconnector "hands off" the hammer catch from the disconnector to the trigger. The problem is that that action is not taking place. This is one of the basic functional checks that should be performed after assembly and durring normal PM. There are several similar functional checks that must be performed prior to firing. If you are going to assume the responsibility of building your own rifle, then you should also take the responsibility to fully understand how it works and how to test it. |
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Thank you for the additional information. I appreciate it. As you say, I need to learn more about it and by me asking the question and you providing clarification, I have done that. All done without putting a round in the chamber.
ETA: there are some great function checks right under my nose in here...so embarrassed.  
ETA2:my trigger passed the above function test smoothly. It was kind of neat to see what you were talking about. Hope your situation resolves. If nothing else, it educated me, so thanks again. |
| I bought two books when I first got started, a assembly manual and maintenance manual. I know all the information can be found on the internet, but it is very handy to have it in front of you when you need to reference something. Since then I've also downloaded and printed out the army tech manual for the M16, also very useful. I havn't been a member on here for very long but do have a fair amount of experience with fire arms in general, and AR's. this forum is a great resource finding out just about anything you might want to know about AR's. |
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Quoted:
Thanks for the information. I might try to do the same with this disconector and hammer. I recieved a response from PSA saying that they have seen this problem several times and that it is out of spec. They offered to supply a shipping label then replace the items once they recieve and inspect them. I am going to try to polish the contacting surfaces first because i don't really want to deal with the pain in the a$$ of shipping it back. So you are going to try to modify the parts before sending them back?  . just send them back and get something that works. They have already said they have seen that this is a problem.
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| spent about 2 hours tonight working on it and happy with the results. it releases every time like it should and feels like it should. I used a knife sharpening stone to polish the contacting surfaces and clean up the edges. I know its not for everyone but I guess I like fixing the problem myself more then just returning the part. if it was something that wasn't fixable, then yes I would have sent it back. Instead of waiting two weeks or more to receive a replacement, I did it myself. isn't that the point of this forum? |
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Quoted:
Yep. It's fixed today and not 2 weeks from now. Plus, you fixed it with your hands and didn't have to rely on somebody else. That's called a skill and is in rapid decline in this country. People were poor when i was growing up,myself included "still am" if you needed something fixed you had to do it yourself. We live in a fast fix world today,people are spoiled,even if they don't have the money thell sit an cry for someone to fix there problem because they think they deserive it. Someone created a nightmare in this country that i don't want any part of. I salute you sleeper_79 and everyone else that helps themselves. I'v been into weapons all my life, because i love the technology,Not because i can just go out and buy whatever i want. |
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Quoted:
I had a Psa kit where I had to push the trigger forward to get it to reset fully. I think we had the same issue. I ended up sanding the area on the hammer that catches the disconnector and the actual disconnector face too. I went incrementally and just made it shiny and smooth with some very fine sandpaper. I found it released freely after just a little smoothing out and applied slp2k grease to both faces. Test firing was fine. If you want pictures I'd be happy to post them for you tomorrow when I'm home from work. It seems like the finish was just a bit too course to let the disconnector pass of the hammer on my kit. Now the trigger resets perfectly. ^This. mine had the same issue, PSA Standard LPK's as well. it drove me nuts for a few weeks.... I was scared to take it to the range. I had it doubling on me when id function check. (releasing pressure on the trigger after th first shot cause it to fire again) That is,, till i busted out some 1000grit sand paper and knocked down the burrs. now she functions like a champ! The final verdict was, the disconnector timing was out of whack and the surfaces were too rough. Now i bubba jobbed the hammer and trigger, along with the disconnector surfaces and have not had a single issue with it since. 
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Are you using anti- rotational pins? One should NEVER mess with the disconnector by polishing or messing with the surfaces unless it is out of spec. The anti rotational pins I.e. KNS have a tendency of holding it tighter not allowing the trigger to reset all the way until you shoot with them. Mine stuck for about the first 5 rds in my spikes lower. I've tried multiple brands of kits in other lowers, never really had trouble with standard trigger group pins other than a little walking out with a polymer lower. But on my fresh new anodized lowers w anti rotational installed it needed breaking in.
Go fire it a few times holding the trigger to the rear I can't tell you how many times people have brought me guns because the disconnector won't hold the hammer under live fire because they modified it |
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