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Posted: 12/16/2008 7:39:36 PM EDT
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I've got a new (2 days) RRA with 60 rnds and 100 dryfires. The 2 stage trigger
was working great with no creep and a nice consistant, light break. Today after shooting (shoots great) I field stripped and cleaned it. Upon reassembly I noticed on the first stage of the pull, the trigger itself wouldn't return forward if pressure was released. It will just stay stuck back at the spot where the second stage would drop the hammer. If I continue to pull after the trigger is "stuck" in that spot, the hammer will fall, but the pressure needed is very inconsistant (usually very light) When the trigger is in the "stuck" spot a little nudge with my finger will make the trigger of forward. I'm thinking maybe a little piece of crud or a chip in the works is causing the problem. I don't think I could of dicked up the sear or anything by dry-firing...could I? Anyboby got an idea? Can anyone point me to a diagram or better yet dissasembly instuctions for the trigger group. Any help would be greatly appreciated. I need my new baby back right!! TIA |
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Sounds like either a bur, or fouling in the FCG,
Start with holding the hammer in uncocked position, and while holding it centered in the receiver drive out the hammer pin. The hammer has an internal J spring that will clear the pin center grove, then may catch the side pin groove depending on which side you drive the pin out (both trigger and hammer pins are the same, with a side groove and a center groove). Just hold the hammer steady centered, and the pin will drive out cleanly. With the hammer removed, the hammer spring legs will no longer retain the trigger pin, and you can punch it out easy. This will allow you to pull the trigger, and disco with spring out of the receiver. With the parts in hand, check the trigger inner slot sides, and even the disconnector it's self (the pin channel sides for burs or crap that has made it way into two. Also, while you have the parts out, dry fit the trigger/disco with spring on pin and make sure that the disco is moving freely. When you go to reinstall, it's just straight backwards as you pulled the parts out, and remember that the hammer spring will rest on the top side of the trigger sides/ the trigger pin. Grated that the guide shows a standard trigger, it pretty much the same assembly/idea for the two stage trigger install (just remember to reinstall the disco spring when you put it back together). http://www.ar15.com/content/guides/assembly/lower/ |
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Quoted:
Sounds like either a bur, or fouling in the FCG, Start with holding the hammer in uncocked position, and while holding it centered in the receiver drive out the hammer pin. The hammer has an internal J spring that will clear the pin center grove, then may catch the side pin groove depending on which side you drive the pin out (both trigger and hammer pins are the same, with a side groove and a center groove). Just hold the hammer steady centered, and the pin will drive out cleanly. With the hammer removed, the hammer spring legs will no longer retain the trigger pin, and you can punch it out easy. This will allow you to pull the trigger, and disco with spring out of the receiver. With the parts in hand, check the trigger inner slot sides, and even the disconnector it's self (the pin channel sides for burs or crap that has made it way into two. Also, while you have the parts out, dry fit the trigger/disco with spring on pin and make sure that the disco is moving freely. When you go to reinstall, it's just straight backwards as you pulled the parts out, and remember that the hammer spring will rest on the top side of the trigger sides/ the trigger pin. Grated that the guide shows a standard trigger, it pretty much the same assembly/idea for the two stage trigger install (just remember to reinstall the disco spring when you put it back together). http://www.ar15.com/content/guides/assembly/lower/ Thanks for the help. That was alot easier than I thought it would be. When I removed the trigger pin it had a long, sharp, spiral scratch (gouge) in it, that went almost 180deg. around the pin, almost its entire length. The only thing I can figure is I must have done that when I took it out, but didn't see what would have scratched it like that, because it came out fairly easy. Didn't see anything to scratch it on.??? I tried to smooth it a bit on a fairly hard, flat stone, but didn't do much, afraid to mess it up. Disco was hard to move, but I seemed to move freely. Could't really do anything with the "dry Fit" cause I dont know what I'm doing. After reassembly The trigger stick kind of comes and goes...??? But it never felt like it did before the trouble started, when the end of the first stage was well defined. No sratches, burrs or crud anywhere else..holes,sear,edges... I'm guessing its the scratched triggrr pin...ya think? I also noticed that I can see the ends of the hammer pin ( that I didn't touch) move a little when I cock the hammer, but it did that before when it was working right. Any more ideas?... or its off to the gunsmith. Thanks again for your help, at least now i know how to clean the FCG. |
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Dano is MUCH better versed than I .
Try this while you wait for another response from him. 1) Remove the FCG again and inspect the holes where the trigger and hammer pin fit in the lower and in the parts themselves. Make sure there are no burrs or particles there. A Q-tip with the cotton removed or a pipe cleaner will help. 2) I doubt it is the trigger pin scratch unless it is deep and IT is burred causing the malfunction. Try switching the trigger and hammer pins (they are the same, but your trigger pin is scratched) and see if that fixes it. If so, a new pin is cheap and RRA would probably send you a new one free anyway. If that fixes the problem, does the scratch go all the way to the ends of the pin? If so, I would try to get a new pin before doing more dry firing/shooting; you don't want to enlarge the pin holes in your lower receiver. |
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Quoted:
Dano is MUCH better versed than I . Try this while you wait for another response from him. 1) Remove the FCG again and inspect the holes where the trigger and hammer pin fit in the lower and in the parts themselves. Make sure there are no burrs or particles there. A Q-tip with the cotton removed or a pipe cleaner will help. 2) I doubt it is the trigger pin scratch unless it is deep and IT is burred causing the malfunction. Try switching the trigger and hammer pins (they are the same, but your trigger pin is scratched) and see if that fixes it. If so, a new pin is cheap and RRA would probably send you a new one free anyway. If that fixes the problem, does the scratch go all the way to the ends of the pin? If so, I would try to get a new pin before doing more dry firing/shooting; you don't want to enlarge the pin holes in your lower receiver. Thanks FLICK, I checked for more replies the next day after my last post, didn't see any, so I havn't been back to this section since. I took it to the gunsmith and he replaced the trigger pin and reamed the edge of the trigger hole (burr) and the trigger is managable now. The pull is now about 2 lbs ( 1lb lighter) but there dosn't seem to be a definate spot between the 1st and 2nd stages. I'm not real happy with the outcome. That trigger pull was soooo sweet before. I was hoping it would be returned to its original pull. I ought to see what RRA has to say about it, probably a long wait . Hate to eat the cost of an aftermarket job. Anyway... thanks again for your suggestions |
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