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Thread: Adams Arms/VLTOR A5 fail to eject

  1. #21
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    Quote Originally Posted by az doug View Post
    Responses in red.
    Also, some added perspective from another recent post of mine:

    "...the carbine buffer system was well outside of the intended design envelope created by Stoner/Sullivan. The carbine RE, spring, and buffer was a red headed stepchild created by Colt in order to make a shorter, adjustable stock possible. If you know your history, you know that it took Colt about a decade of making this system before they could get it to function with any advertisable degree of "reliability".

    It was a compromise then and it's still a compromise now."

    https://www.m4carbine.net/showpost.p...7&postcount=25
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  2. #22
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    Adams Arms/VLTOR A5 fail to eject

    Big thanks for all the discussion guys. I won't be able to work on this for another 5 days or so, but I have plenty to think about. I don't plan on "dumping tons of money" into this upper. It is a brand new upper, and as far as I'm concerned, if it doesn't work, it must be defective. I already put extra money into the rifle by getting the piston upper and the Vltor buffer, because those are the things I wanted, so you're not going to be able to talk me into changing to DI or anything else. I'm going to try my best to get it working like this. I am going to try to fire it on a friend's functioning lower with standard carbine buffer system, and I am going to order a standard carbine buffer so I can play around with the weights (I have none and you definitely cannot find Vltor buffers right now).

    One of y'all said something about piston guns cycling much faster than intended. I had heard that too when I was researching for this build. The A5 system with the longer tube and spring and heavier buffer is supposed to slow the cyclic rate. Shouldn't that help me, rather than hurt me?

  3. #23
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    Quote Originally Posted by gwilki2 View Post
    Big thanks for all the discussion guys. I won't be able to work on this for another 5 days or so, but I have plenty to think about. I don't plan on "dumping tons of money" into this upper. It is a brand new upper, and as far as I'm concerned, if it doesn't work, it must be defective. I already put extra money into the rifle by getting the piston upper and the Vltor buffer, because those are the things I wanted, so you're not going to be able to talk me into changing to DI or anything else. I'm going to try my best to get it working like this. I am going to try to fire it on a friend's functioning lower with standard carbine buffer system, and I am going to order a standard carbine buffer so I can play around with the weights (I have none and you definitely cannot find Vltor buffers right now).
    Sounds like a solid plan. Try the upper out with the mfg. recommended buffer/spring. That will give you a baseline and let you determine if there is any defect with the upper that you may need to contact AA about.

    Quote Originally Posted by gwilki2 View Post
    One of y'all said something about piston guns cycling much faster than intended. I had heard that too when I was researching for this build. The A5 system with the longer tube and spring and heavier buffer is supposed to slow the cyclic rate. Shouldn't that help me, rather than hurt me?
    One would assume that the A5 would be a help, but it hasn't helped so far. If the AA upper wont work with the standard weight A5 buffer, that makes me think that the two just don't play well together. Needing to drop down to the lightest A5 buffer is another indicator in my mind that the upper/buffer combo don't mix very well. Most A5 users are able to go heavier than the standard A5 buffer.

  4. #24
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    Everyone relax and quit pissing in the opposing party's Cheerios. Thanks



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  5. #25
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    Now that we are done arguing who said what first and who is more right, let's get back to helping the OP troubleshoot his upper.

    Just remembered this thread.
    https://www.m4carbine.net/showthread.php?t=135259
    That Independence ammo can be very hot. I can't see how that would cause what the OP is experiencing, but keep it in mind if you are still using it.

    Definitely test the upper with the buffer configuration that Adams Arms recommends. You want to know if there is an issue that would warrant AA either repairing or replacing it. I strongly suspect there is an issue with it if it wont run on a A5, or those AA uppers are real picky about only using a carbine type buffer.

  6. #26
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    OP,

    As I have mentioned in other threads, you need to isolate the problem. In this case since there is no real starting point, but you mentioned it working without a seated magazine then you need to start by getting another lower.

    I would locate a known variable lower (IOW one that works) and I would test the upper on it. If it functions as it should, then you have to start to look at your lower. When you do this make sure to use the same magazines and ammunition.

    I would test the lower by using the other upper on your lower and see if there are binding issues. This is just another method of validation. If you know this upper works and you put it in your lower and it now starts to malfunction you can be all but assured this is the issue.

    If you put your upper on the other lower and it does not work, then it would be safe to assume that the upper is at fault. I would then look at the following;

    1. Is the upper receiver possibly out of spec?

    2. Is the charging handle itself out of spec and causing binding?

    3. Was the gas block/ piston manufactured wrong? Canted or otherwise.

    I would also fully assemble the weapon, and SLOWLY manipulate the charging handle and attempt to isolate the "dragging" Do it with and without a magazine. Maybe the magwell is cut wrong? Maybe the rear of the receiver was cut wrong and the lower receiver extension is crooked. I saw this once (and only once) and when the tube was threaded it was crooked. This caused the carrier to rub inside the tube.



    Owner/Instructor at Semper Paratus Arms

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  7. #27
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    Quote Originally Posted by elephantrider View Post
    Now that we are done arguing who said what first and who is more right, let's get back to helping the OP troubleshoot his upper.
    Whats to argue, there is a chronological record in public access!

    Quote Originally Posted by elephantrider View Post
    I strongly suspect there is an issue with it if it wont run on a A5, or those AA uppers are real picky about only using a carbine type buffer.
    According to Vltors website, they only offer HEAVIER buffers than what is supplied in the "kit". I think putting this upper on a standard carbine lower is the only way to go if it does in fact need a lighter buffer...

  8. #28
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    There are multiple A5 buffers available. The lightest is essentially equivalent to a carbine H buffer. Unfortunately they are still unobtanium for a little while longer.

    Quote Originally Posted by Mall_Ninja View Post
    Whats to argue, there is a chronological record in public access!



    According to Vltors website, they only offer HEAVIER buffers than what is supplied in the "kit". I think putting this upper on a standard carbine lower is the only way to go if it does in fact need a lighter buffer...



    Owner/Instructor at Semper Paratus Arms

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  9. #29
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    OP,

    Are you noticing any abnormal marks or scoring on the bottom of the BCG or the top of your magazines?

    FYI,
    Things that I did while breaking in my AA uppers was to run them very wet for the first 500rds, kept my buffer weight at 3.8oz with 5.56 pressure loads and swapped out my factory cam pin with a Roller Cam Pin from POF-USA. A few thousand rounds later she is still chugging along without issue.
    We are all inclined to judge ourselves by our ideals; others, by their acts.

  10. #30
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    Adams Arms/VLTOR A5 fail to eject

    Quote Originally Posted by PA PATRIOT View Post
    OP,

    swapped out my factory cam pin with a Roller Cam Pin from POF-USA.
    What was the reason you decided to do this?

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