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re: ***UPDATE NO.3**My new AR is cycling .223 fine but hanging up on 5.56
Posted on 1/13/15 at 10:53 pm to Clames
Posted on 1/13/15 at 10:53 pm to Clames
Yes, it does chamber a round every time from a fully locked back position. The only time it doesnt return to full battery is after the initial shot when rechambering the 2nd round.
1
Posted on 1/14/15 at 7:31 am to dnm3305
Measure the action spring and tell us the exact length if you can. Also, take a chamber brush and scrub the hell out of the chamber with plenty of solvent. Make sure the chamber is patched until dry before shooting again.
Posted on 1/14/15 at 8:17 am to Clames
Ok, I'll have to do that this evening. Action spring is the large "buffer spring" correct? I got in touch with my cousin and we'll swap uppers this weekend and shoot various types of ammo including my suspect ammo and I think that will lead us in the right direction. That is, if PSA doesnt get in touch with me between now and then and tells me to ship it back to them. I have called 100 times in 2 days, left messages and left an email with photos and no word yet.
This post was edited on 1/14/15 at 8:19 am
Posted on 1/14/15 at 8:20 am to Clames
I'm no expert by any means but it sounds like gas tube or buffer. If it fires first round and not second then it sounds like the gas or buffer isnt doing its job.
I would try a small box of different 5.56 and try to interchange the buffer assembly with a friend. Those gas blocks are a pain so hopefully (and unlikely) it isn't the gas tube.
I would try a small box of different 5.56 and try to interchange the buffer assembly with a friend. Those gas blocks are a pain so hopefully (and unlikely) it isn't the gas tube.
Posted on 1/14/15 at 8:21 am to dnm3305
quote:
. I have called 100 times in 2 days, left messages and left an email with photos and no word yet.
How strange. I have always been able to get then in first try.
Posted on 1/14/15 at 8:22 am to dnm3305
Did you tap the forward assist?
Posted on 1/14/15 at 8:29 am to chesty
quote:
Did you tap the forward assist?
Yup. At various stages. It doesnt make the round seat nor does it make BCG fully lock.
Posted on 1/14/15 at 8:55 am to dnm3305
DON'T swap uppers. Just pull his buffer and action spring. Swap them in and see if your rifle runs. If it does. Swap your buffer back in but keep his spring. Test again and if it fails you know the buffer itself is an issue. If it keeps working swap your spring back in. If it fails then you know the exact issue. Compare the springs to see if you got one that is noticeably shorter. Also inspect the fired brass, compare to see scratches or a frosted look that comes from a rough chamber.
Posted on 1/14/15 at 9:06 am to Clames
I agree with above. I would also try the different ammo if it still doesn't work.
Posted on 1/14/15 at 9:08 am to Clames
quote:
DON'T swap uppers. Just pull his buffer and action spring. Swap them in and see if your rifle runs. If it does. Swap your buffer back in but keep his spring. Test again and if it fails you know the buffer itself is an issue. If it keeps working swap your spring back in. If it fails then you know the exact issue. Compare the springs to see if you got one that is noticeably shorter
Ok, we will do this first. We will shoot my ammo through his rifle before modification to make sure the ammo functions and to eliminate that. We'll then do the buffer/spring swap into my rifle. If my rifle does operate with his buffer/spring then we have narrowed it down considerably to one of those two things (my buffer or spring is cause) If my rifle still doesnt operate with his buffer/spring then that will be eliminated from my list of potential issues, so back to possible headspace issue/gas system/hammer spring misorientation?
Posted on 1/14/15 at 9:35 am to dnm3305
Could be a rough chamber which is why you need to inspect the brass before and after firing. I tested mine with XM855 that I polished the cases so any roughness or burr would be obvious. A rough chamber causes the case to stick which takes away energy from the extraction and subsequently the energy needed to chamber the next round.
Posted on 1/14/15 at 9:49 am to Clames
quote:
Could be a rough chamber which is why you need to inspect the brass before and after firing. I tested mine with XM855 that I polished the cases so any roughness or burr would be obvious. A rough chamber causes the case to stick which takes away energy from the extraction and subsequently the energy needed to chamber the next round.
Ok, I will look into that. PSA just called me back BTW, and although it wasnt a "field tech" it was a guy acknowleding my email and messages and telling me that I should get a call in the next few days from a tech that can help diagnose over the phone (if we cant do it by ourselves before they call obviously). If not, then I'll ship it back. Thanks for all the info and your time guys. I will respond back when we get this resolved or we troubleshoot it further and hit a dead end.
Posted on 1/21/15 at 7:50 pm to dnm3305
Bump for UPDATE NO.2
Posted on 1/21/15 at 8:12 pm to dnm3305
I'm no expert, but that struck but unfired bullet scares the hell out of me.
Posted on 1/21/15 at 8:13 pm to SportTiger1
quote:
I'm no expert, but that struck but unfired bullet scares the hell out of me.
Why are you thinking this? Headspace issue like was being discussed earlier in the thread?
Posted on 1/21/15 at 8:20 pm to dnm3305
TL/DR
Sounds like PSA may have given you a .223 bbl label as a 5.56. Not the first time a company has been found guilty of this, and I wouldn't put it past PSA to try to move some of their slow inventory this way. Or, the chamber could be out of spec. Either way, the way the AR bolt is designed the firing pin is not fully exposed until the bolt is locked into the bbl extension. This would explain the light strikes. This is so that you cannot fire a round when the bolt isn't locked. That would end badly for your face most likely. Best case would be the charging handle ramming into your face, worst would be your face taking the blunt of the shrapnel from an exploding upper. Get a gauge and test it or send it back to PSA and come get one of my ARs.
Sounds like PSA may have given you a .223 bbl label as a 5.56. Not the first time a company has been found guilty of this, and I wouldn't put it past PSA to try to move some of their slow inventory this way. Or, the chamber could be out of spec. Either way, the way the AR bolt is designed the firing pin is not fully exposed until the bolt is locked into the bbl extension. This would explain the light strikes. This is so that you cannot fire a round when the bolt isn't locked. That would end badly for your face most likely. Best case would be the charging handle ramming into your face, worst would be your face taking the blunt of the shrapnel from an exploding upper. Get a gauge and test it or send it back to PSA and come get one of my ARs.
Posted on 1/21/15 at 8:21 pm to dnm3305
I think we can discard the headspace issue, it really wasnt ever an issue.
Im thinking maybe a weak hammer spring. Thatd be my next guess.
556 ammo may use primers that are harder to ignite than 223 ammo.
Sometimes a primer that has been struck like the one in the picture can ignite at a later time, called a hangfire. Typically, they say to wait about 30 seconds after the click and then the round is safe to eject. Its not a good thing, but typically its more indicative of the ammo and not the gun.
Im thinking maybe a weak hammer spring. Thatd be my next guess.
556 ammo may use primers that are harder to ignite than 223 ammo.
Sometimes a primer that has been struck like the one in the picture can ignite at a later time, called a hangfire. Typically, they say to wait about 30 seconds after the click and then the round is safe to eject. Its not a good thing, but typically its more indicative of the ammo and not the gun.
Posted on 1/21/15 at 8:33 pm to kengel2
quote:
Its not a good thing, but typically its more indicative of the ammo and not the gun.
It did this over 30 times today and the ammo ran fine through the other rifle present. I think ammo is 100% out of the question.
quote:
Im thinking maybe a weak hammer spring. Thatd be my next guess.
Thats about one of the only things we didnt get to. I would think taking my complete upper off and replacing with his complete upper and see if we still get a misfire would diagnose that. If round is still misfiring on my lower with his upper that is proven then we can narrow it down to my lower issue, possible hammer spring.
Posted on 1/21/15 at 8:39 pm to dnm3305
honestly you should send that thing back and get them to fix it. Its cool to experiment until the gun blows up in your face.
Posted on 1/21/15 at 8:48 pm to diat150
quote:
honestly you should send that thing back and get them to fix it. Its cool to experiment until the gun blows up in your face.
That has been the plan all along. I will send it back. I need to actually get in touch with them first to be able to send it back. Ive always heard the PSA had horrible customer service and unfortunately Im feeling that now. I left multiple phone messages and emails at the beginning of last week at PSA customer service. They finally contacted me around Wednesday of last wk saying they received my call and would get back to me with a "tech" in a few days. It's been a wk and no word. I absolutely will send the rifle back but I wanted to gather as much info as possible in the mean time.
This post was edited on 1/21/15 at 8:49 pm
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