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Thread: Adams Arms/VLTOR A5 fail to eject

  1. #31
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    All AR's have a certain amount of cam pin gouge which is normal and the wear often stops after a certain point. But I have noticed that AA uppers seem to be a little more critical when it comes to Cam gouging but its a simple and easy fix by either using the Roller Cam Pin from POF-USA or the R.E.P.R. Cam Pin from LWRC.

    While this gouging issue will settle down and most likely stop completely with time it is just another friction point for your new build to over come while cycling.

    I run the Roller Cam Pin on all my Piston guns and the R.E.P.R. on any new DI gun, for the few dollars they cost it just added piece of mind.
    We are all inclined to judge ourselves by our ideals; others, by their acts.

  2. #32
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    Just got home, been gone for about a week, so I decided to break the gun down and inspect/clean it. I looked inside the RE for any damage. It just looks like the finish is flaking off along the bottom. That's not a big deal, is it?


  3. #33
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    Quote Originally Posted by gwilki2 View Post
    Just got home, been gone for about a week, so I decided to break the gun down and inspect/clean it. I looked inside the RE for any damage. It just looks like the finish is flaking off along the bottom. That's not a big deal, is it?

    WOW! This was a brand new RE on this (the piston rifle with issues) lower? Looks like your carrier tilt is putting a whooping on it!

  4. #34
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    You have some problems there for sure, but looking at the two wear marks in the 3' and 9' o'clock positions on the face on the buffer tube ring shows something is really a miss.

    ETA,

    I don't think carrier tilt is causing this.
    Last edited by PA PATRIOT; 08-12-13 at 16:54.
    We are all inclined to judge ourselves by our ideals; others, by their acts.

  5. #35
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    The bolt carrier is retracting too far into the receiver extension. I saw the same marks last Friday on a DI 308 with an A5 receiver extension and carbine buffer. Testing the carrier of the 308, it would go into the receiver extension far enough that the widened portion of the bolt carrier made contact with the receiver.

    I just pulled one of my AA carriers and it does have widened points that would contact the lower at 3 & 9, just like your photo. In your photo, I can also see marks at 12 o'clock that appear to be made by contact with the bolt carrier.

    The carrier will quit making contact with the lower when enough material has been removed/damaged from the receiver and the buffer bottoms out on the back of the receiver extension, like it is suppose to. The wear/damage is unacceptable and should not be happening.

    You can test my theory of bolt carrier damage by removing the buffer spring and reinserting the buffer back into the receiver extension. With your bolt carrier push the buffer as far back as it will go and see if the buffer bottoms out before the carrier makes contact with the receiver. If it does not bottom out you will see where the carrier contacts the receiver. If it does bottom out, look and see where the carrier would contact the receiver and it would probably 3 & 9. If it does bottom out, your carrier has caused enough damage/"cut a path of the carrier" and should not cause any more damage.

  6. #36
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    Quote Originally Posted by az doug View Post
    The bolt carrier is retracting too far into the receiver extension. I saw the same marks last Friday on a DI 308 with an A5 receiver extension and carbine buffer. Testing the carrier of the 308, it would go into the receiver extension far enough that the widened portion of the bolt carrier made contact with the receiver.

    I just pulled one of my AA carriers and it does have widened points that would contact the lower at 3 & 9, just like your photo. In your photo, I can also see marks at 12 o'clock that appear to be made by contact with the bolt carrier.

    The carrier will quit making contact with the lower when enough material has been removed/damaged from the receiver and the buffer bottoms out on the back of the receiver extension, like it is suppose to. The wear/damage is unacceptable and should not be happening.

    You can test my theory of bolt carrier damage by removing the buffer spring and reinserting the buffer back into the receiver extension. With your bolt carrier push the buffer as far back as it will go and see if the buffer bottoms out before the carrier makes contact with the receiver. If it does not bottom out you will see where the carrier contacts the receiver. If it does bottom out, look and see where the carrier would contact the receiver and it would probably 3 & 9. If it does bottom out, your carrier has caused enough damage/"cut a path of the carrier" and should not cause any more damage.
    Just tested this. The buffer does bottom out before the carrier hits the receiver. In doing this I noticed that the hammer exerts a good bit of upward force on the carrier. Is this normal?

  7. #37
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    Re: Adams Arms/VLTOR A5 fail to eject

    Maybe I missed it.
    Did the OP contact the manufacturer yet?

    Typos brought to you via Tapatalk and autocorrect.
    Jack Leuba
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    jleuba@knightarmco.com

  8. #38
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    Yes, I contacted Adams Arms, and they recommended using a "standard carbine buffer." If they mean switching to a standard carbine buffer tube/spring/buffer, then I'm not going to try that just yet... I bought the VLTOR A-5 for a reason, and want to try to get it working that way first before I ditch the whole thing. If they mean just using a lighter buffer, then I'd love to, but VLTOR's buffers are impossible to find right now. I'm working on swapping out some weights in my A5H2 buffer to lighten it up, but I haven't gotten around to it yet. I've been on vacation for the past week.

    I also contacted VLTOR. After a few e-mails back and forth explaining the problem, I haven't heard from them in a few days.

  9. #39
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    Quote Originally Posted by gwilki2 View Post
    ...the hammer exerts a good bit of upward force on the carrier. Is this normal?
    It is normal. Usually the carrier would be installed in the upper and "held in place" while the hammer exerts the upward force on the bottom of the bolt carrier.

  10. #40
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    Quote Originally Posted by gwilki2 View Post
    Just got home, been gone for about a week, so I decided to break the gun down and inspect/clean it. I looked inside the RE for any damage. It just looks like the finish is flaking off along the bottom. That's not a big deal, is it?

    That looks like the dry film lubricant being worn off of the inside of the receiver extension. Looks like mostly at the 9 o'clock position. None of the 4 or 5 A5 equipped lowers that I have exhibit anything like that, so I am going to go ahead and say it's not normal.

    Quote Originally Posted by gwilki2 View Post
    Yes, I contacted Adams Arms, and they recommended using a "standard carbine buffer." If they mean switching to a standard carbine buffer tube/spring/buffer, then I'm not going to try that just yet... I bought the VLTOR A-5 for a reason, and want to try to get it working that way first before I ditch the whole thing. If they mean just using a lighter buffer, then I'd love to, but VLTOR's buffers are impossible to find right now. I'm working on swapping out some weights in my A5H2 buffer to lighten it up, but I haven't gotten around to it yet. I've been on vacation for the past week.

    I also contacted VLTOR. After a few e-mails back and forth explaining the problem, I haven't heard from them in a few days.
    Iraqgunz gave you the exact advice you need to isolate your problem and potentially resolve it. There is something out of whack with either your upper or your lower. You need to test them independently with known working upper/lowers in order to figure out where the problem lies. For all you know you upper came faulty from AA. You will never know that until you test it with a known good lower that is set up with the RE/Buffer that they recommend (Yes, they are talking about a standard carbine style RE, and probably an H buffer). You MAY get your upper working by cracking open you A5 buffer and fiddling with the weights, but the wear you are seeing in the A5 RE is a hint that there may be more wrong than just an incorrect buffer weight.

    I doubt that Vltor will be able to help you much. The only way that the A5 is causing the problem is if the RE is off center or crooked. It's possible, but I'd guess there is an issue with the upper or lower before that.

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