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Posted: 1/2/2016 7:13:59 PM EDT
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I built this rifle about two years ago now. It's been functioning just fine. I'm using a bilet upper and lower. Not sure who they are made by, as it was a local gun shops engraved lower. It has a psa premium lpk, geisselle ssae trigger, colt buffer, tube, spring. Barrel is a Wilson combat 18" fluted middie, 1 in 8 twist.
I have around 600 rounds through this rifle, and other then being over gassed while suppressed it has been reliable and accurate. With the can on, I'm getting a 130ish ejection but no malfunctions. 245 to 3 without the can. I started having chambering issues when dropping the bolt on a fresh mag. It wasn't stripping a round from magazine, I used Magpul Gen 2 and Lancer, as well as a usgi. Then when I charged it using the handle, it would feed and function. Now, when I feed it a round, I'm getting a click but no primer strike. I have to mortar the charging handle to eject the round. Click no bang again and again. I thought it may be a bcg issue so I switched with my psa m4gery which has been flawless. Same issue. I switched the carriers back. Then I switched the malfunctioning rifle upper on the psa lower. 20 rounds feed and functioned no issues. I put the psa m4 upper on the spr lower. 20 round mag dump, locked back on empty. I put the rifles back into original configuration, psa is fine, spr is deadlined. Could this be an upper or lower out of spec? Stacking tolerances? I will say the fit of the spr is perfect, no slop. It has a tensioner but I'm not using it. I haven't stripped the rifle apart yet, but I thought I'd ask the experts what they thought before I throw this thing down my driveway. Let me know what you think may be an issue, I've not had an AR malfunction like this before, thus is probably my 6th build and first to do anything like this. Thank you Pics of offender 
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I accidentally uploaded the wrong photo. I've went to a fixed stock. 
Also. I think this may be ammo related. I've been using mostly wolf gold, federal 223, lake city green tip, and American Eagle 40 grain varmint black tip stuff. No issues. Yesterday I was using nothing but made in Turkey, guardian 556, 62 ss109. I've loaded magazines with all of these types. Guess which is the only rounds that will not fully chamber in my rifle. 
Jamming ammo 
Could my chamber be tight? Or is this ammo out of spec? It is very accurate in my other rifles, just under 2 moa. |
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I have some of that guardain ammo but have not shot any. I need to shoot it in a couple of my AR's to see if I have any problems. I heard other have also had problems with the guardain ammo but got it pretty cheap. I bought it any way. I will give it a try. It's been awesome in my other rifles with less exotic parts. |
| Ar is chambering these cartridges now. Can't believe the bore had so much stuff inside of it. In thinking this was the cause of the malfunctions. I am going to disassemble the gas block and install an adjustable to fix the over gas problems, and hopefully that will reduce my chamber fouling issues. |
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A while back I built an upper for a friend, PSA BCG and AR15Performance barrel.
It swallowed a go gage. A month later I saw PSA had GECO ammo for a good price, which I passed on to the same friend. The bolt will not go into battery with that ammo. That ammo runs fine in every other upper we've tried. The chambers of all those rifles gage within spec. It is possible that the ammo is a bit long... decap a 9mm case and drop the mouth on the business end of one of the suspect rounds. Measure the length from case bottom to case bottom, then compare this dimension to other ammo. Joe Quoted:
I accidentally uploaded the wrong photo. I've went to a fixed stock. http://i1172.photobucket.com/albums/r574/skinnedjagon/20160102_175920_zpsze33tkdi.jpg Also. I think this may be ammo related. I've been using mostly wolf gold, federal 223, lake city green tip, and American Eagle 40 grain varmint black tip stuff. No issues. Yesterday I was using nothing but made in Turkey, guardian 556, 62 ss109. I've loaded magazines with all of these types. Guess which is the only rounds that will not fully chamber in my rifle.
http://i1172.photobucket.com/albums/r574/skinnedjagon/20160102_180804_zpstlqmekjf.jpg Jamming ammo http://i1172.photobucket.com/albums/r574/skinnedjagon/20160102_180904_zpstqhdlka4.jpg Could my chamber be tight? Or is this ammo out of spec? It is very accurate in my other rifles, just under 2 moa. |
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Ar is chambering these cartridges now. Can't believe the bore had so much stuff inside of it. In thinking this was the cause of the malfunctions. I am going to disassemble the gas block and install an adjustable to fix the over gas problems, and hopefully that will reduce my chamber fouling issues. Get into the practice of cleaning the chamber and bore after every use. You can avoid issue like this in the future. |
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Ar is chambering these cartridges now. Can't believe the bore had so much stuff inside of it. In thinking this was the cause of the malfunctions. I am going to disassemble the gas block and install an adjustable to fix the over gas problems, and hopefully that will reduce my chamber fouling issues. That's what suppressors do. Adjustable block won't do much for cleanliness because what happens is the baffles maintain gas pressure past the muzzle, which blows back after the bullet leaves. |
| The more I look at this thing the more I see that there is something wrong here. When I slowly lower the bolt down it gets caught up and hits and stick the back of the barrel. None of my other rifles do this. I need to take this thing assist but the god damn rock set is holding fast. I ordered a reaction rod to help. Going to reduce thing to components and rebuild it. |
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Quoted: The more I look at this thing the more I see that there is something wrong here. When I slowly lower the bolt down it gets caught up and hits and stick the back of the barrel. None of my other rifles do this. I need to take this thing assist but the god damn rock set is holding fast. I ordered a reaction rod to help. Going to reduce thing to components and rebuild it. |
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The more I look at this thing the more I see that there is something wrong here. When I slowly lower the bolt down it gets caught up and hits and stick the back of the barrel. None of my other rifles do this. I need to take this thing assist but the god damn rock set is holding fast. I ordered a reaction rod to help. Going to reduce thing to components and rebuild it. So are the bolt lugs hanging up on the barrel extension? Both carriers hang up? Is your barrel extension clean, do you lube your bolt lugs? Cam key, head space issues, carrier key hitting gas tube? |
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its the lower remove inspect buffer spring/buffer/clean tube inspect/clean FCG, function check it. thats the only two things that could cause it Quoted:
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Then I switched the malfunctioning rifle upper on the psa lower. 20 rounds feed and functioned no issues. its the lower remove inspect buffer spring/buffer/clean tube inspect/clean FCG, function check it. thats the only two things that could cause it Reread my original post, "defective" lower functioned on psa upper. It's the upper, bcg not going into battery anymore. |
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Can you explain this a little better? What is catching on what? Quoted:
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The more I look at this thing the more I see that there is something wrong here. When I slowly lower the bolt down it gets caught up and hits and stick the back of the barrel. None of my other rifles do this. I need to take this thing assist but the god damn rock set is holding fast. I ordered a reaction rod to help. Going to reduce thing to components and rebuild it. Sorry, I had to do some family things today and didn't update. What I mean is, I noticed that, when I was looking at the bcg through the ejection port, I could see the edge of the carriers rail. Typically, you can't see this. When I road the charging handle, the bolt face hangs up on the receiver extension, then pushes in, sometimes I would have to use the forward assist. Like I said, this is pretty weird. Maybe my barrel nut isn't correct. I've ordered a reaction rod as I cannot get the stupid Aac 51t off, I think my smith put rock set on it and the clam shell won't hold up to that. I'll take some pictures tomorrow and upload them in the morning |
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Quoted: Sorry, I had to do some family things today and didn't update. What I mean is, I noticed that, when I was looking at the bcg through the ejection port, I could see the edge of the carriers rail. Typically, you can't see this. When I road the charging handle, the bolt face hangs up on the receiver extension, then pushes in, sometimes I would have to use the forward assist. Like I said, this is pretty weird. Maybe my barrel nut isn't correct. I've ordered a reaction rod as I cannot get the stupid Aac 51t off, I think my smith put rock set on it and the clam shell won't hold up to that. I'll take some pictures tomorrow and upload them in the morning Quoted: Quoted: Quoted: The more I look at this thing the more I see that there is something wrong here. When I slowly lower the bolt down it gets caught up and hits and stick the back of the barrel. None of my other rifles do this. I need to take this thing assist but the god damn rock set is holding fast. I ordered a reaction rod to help. Going to reduce thing to components and rebuild it. Sorry, I had to do some family things today and didn't update. What I mean is, I noticed that, when I was looking at the bcg through the ejection port, I could see the edge of the carriers rail. Typically, you can't see this. When I road the charging handle, the bolt face hangs up on the receiver extension, then pushes in, sometimes I would have to use the forward assist. Like I said, this is pretty weird. Maybe my barrel nut isn't correct. I've ordered a reaction rod as I cannot get the stupid Aac 51t off, I think my smith put rock set on it and the clam shell won't hold up to that. I'll take some pictures tomorrow and upload them in the morning |
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If the flash hider was attached with Rocksett, you'll have to soak it in water to dissolve the Rocksett.
At least one of the issues you might be dealing with is the chamber. If you have a tight match grade chamber, and you're trying to put non-match grade ammo in it, it will extract painfully, in a manner like you described. |
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