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Thread: FTF with New Gun (Pics) *Update on p.3*

  1. #31
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    Again guys, thanks for the comments on this problem. I'm becoming more convinced that this is a problem with the speed of the bolt traveling rearwards. The ammo should not be a factor since the malfunctions occurred with 'name brand', American made ammo as well as the Guatemalan surplus, and the magazines are out due to the variation of the three mags, and the fact that the one that seems to be in question has worked perfectly in 2 other ARs. Take a look at this photo of the underside of the BCG. Does that amount of brass residue seem odd to you?


  2. #32
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    Have fired many crates of the Guatemalan surplus (both the plastic camo battle packs and the black).

    It's dirty but it runs in everything. I would be really surprised if it's the ammo.

  3. #33
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    Here is what I would do. Get some Federal M193 or similar not reloads or surplus and see what happens. If you have the same issue you can CONCLUSIVELY rule out the ammo.

    If possible try some different buffers. I am not saying that you should buy any but if you know others that may be able to swap around with you that would be great.

    Otherwise I think you should contact BCM and explain the issue and ask about sending it back for examination.



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  4. #34
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    OP: you mentioned you installed the Knight rail yourself, is it possible you might have messed up the gas tube in the process, restricting the gas flow just enough to get these malfunctions? I've seen a number of gas tubes crushed by joe installing PEQ boxes and other stuff on A2s, I know I almost did just that my first time mounting the old PAQ-2.
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  5. #35
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    I don't see how installing a KAC rail or a PEQ would cause any of these issues. That makes no sense whatsoever.

    Quote Originally Posted by rero360 View Post
    OP: you mentioned you installed the Knight rail yourself, is it possible you might have messed up the gas tube in the process, restricting the gas flow just enough to get these malfunctions? I've seen a number of gas tubes crushed by joe installing PEQ boxes and other stuff on A2s, I know I almost did just that my first time mounting the old PAQ-2.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

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    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  6. #36
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  7. #37
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    Iraqgunz: its been a good long time, so I'm probably confused on the matter, but I seem to recall mounting something onto my A2 back when we still had them that involved putting bolts through the handguard and attaching to the barrel or something like that, up by the front sight post, and that if done incorrectly it could pinch off the gas tube causing all sorts of issues. Then again, I could be completely mistaken and or we just went about installing stuff wrong.

    Now granted I don't see how installing a KAC rail would cause a situation like that, just tossing out something else to look into to, just to cover all the bases, not trying to imply the OP is incompetent or anything, weird stuff happens from time to time, thats all.
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  8. #38
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    Quote Originally Posted by mr_blond View Post
    The same mag:



    Might be camera angle but the mag does look just a slight bit "whacky" up at the feed lips. They aren't bent at all?

  9. #39
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    Quote Originally Posted by mr_blond View Post
    With three different known-functioning mags, I did the one round test several times. It locked back on most of them, and came back to battery on the empty mag around 30% of the time.

    So 30% of the time the bolt failed to lock open on a empty magazine?

    Fire one round while pushing in on the bolt catch, hold the rifle as loosely as possible.

    Did you put a wrench to the carrier key bolts?

  10. #40
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    I'm sure I'll get scolded for this... but you are holding the rifle firmly against your shoulder, right?

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