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Thread: Experienced Opinions - Short Stroke? Bolt Overrun? BAD?

  1. #21
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    Quote Originally Posted by rob_s View Post
    Most people are going to point to the BAD lever because... well they just will. Until you take it off and shoot the gun, and try the test Grant mentions, it's kind of pointless to speculate and it's going to be hard for people to get over the BAD.
    You are right, I am not sure why. If you have used a BAD, then you know it is a necessity. When I first got my BAD, my AR buddys were giving me crap, saying all sorts of stuff... unintentional discharge, and carrier problems, and trigger problems when wearing gloves. 2 years later, no problems, and wouldnt take it off my gun.

  2. #22
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    I pointed to the BAD lever because if I was to guess, the weapon was fine until it was installed and because I have seen more than a handful of posts here where people have installed it and then had some type of issue.

    Quote Originally Posted by rob_s View Post
    Most people are going to point to the BAD lever because... well they just will. Until you take it off and shoot the gun, and try the test Grant mentions, it's kind of pointless to speculate and it's going to be hard for people to get over the BAD.



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  3. #23
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    Quote Originally Posted by dirtyhoboC View Post
    It sounds like the new upper has an oversized gas hole to me. What weight buffer do you have? Cheap to get a heavier one and try it out. I would loan you mine, but i'm in AZ. I know this video is for a piston setup, but I saw it on one of the topics the other day. Good cut out animations.
    http://www.youtube.com/watch?v=2LltApvOC0U
    skip to 4:27
    it sounds like your problem to the T.
    If you refer to my OP, this upper ran 100% through 1,000s of rounds with no problems on my LMT lower with BAD. It's not new.
    The lower is and has the same H buffer and Springco blue spring as the LMT lower.
    Scoby


    “Laws that forbid the carrying of arms disarm only those who are neither inclined nor determined to commit crimes. Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man.”Thomas Jefferson, quoting 18th century criminologist Cesare Beccaria in “On Crimes and Punishment”, 1764

  4. #24
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    It's called a gas port, not hole. I also doubt very much that it is overgassed. Yes, it can happen. But DD is not known for making such barrels. Also, if you read the Op's first post, he clearly states he is using an H buffer which should be prefectly fine for a midlength.

    Quote Originally Posted by dirtyhoboC View Post
    It sounds like the new upper has an oversized gas hole to me. What weight buffer do you have? Cheap to get a heavier one and try it out. I would loan you mine, but i'm in AZ. I know this video is for a piston setup, but I saw it on one of the topics the other day. Good cut out animations.
    http://www.youtube.com/watch?v=2LltApvOC0U
    skip to 4:27
    it sounds like your problem to the T.



    Owner/Instructor at Semper Paratus Arms

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

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  5. #25
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    Quote Originally Posted by Iraqgunz View Post
    I pointed to the BAD lever because if I was to guess, the weapon was fine until it was installed and because I have seen more than a handful of posts here where people have installed it and then had some type of issue.
    I'm not calling anyone out on it, or questioning the advice, I'm simply pointing out that until it's eliminated as the cause the discussion is unlikely to reveal any solutions.

  6. #26
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    Went back a took a look at some old threads. I remember reading it when it was posted a year ago.

    It's not a bad thread, even though there is alot of speculation on a diagnosis going on. To be fair, I suppose in order to make a diagnosis, you have to speculate in some cases.

    http://m4carbine.net/showthread.php?t=72919

    I know what I won't do and that is cut down a spring as someone in the above thread suggested for a fix.
    Last edited by Scoby; 02-19-12 at 11:23.
    Scoby


    “Laws that forbid the carrying of arms disarm only those who are neither inclined nor determined to commit crimes. Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man.”Thomas Jefferson, quoting 18th century criminologist Cesare Beccaria in “On Crimes and Punishment”, 1764

  7. #27
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    Diagnosis is best in person. That being said... Mix in short stroke tests at each stage and see what the problem follows or is remedied by:

    Clean and lube
    Remove sprinco, install GI spring
    Remove BAD
    Test fire a .223 SAAMI load instead of M193

    I think you're over-sprung.
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  8. #28
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    Quote Originally Posted by dirtyhoboC View Post
    You are right, I am not sure why. If you have used a BAD, then you know it is a necessity. When I first got my BAD, my AR buddys were giving me crap, saying all sorts of stuff... unintentional discharge, and carrier problems, and trigger problems when wearing gloves. 2 years later, no problems, and wouldnt take it off my gun.
    Honestly speaking, when I see an AR having CERTAIN issues, the VERY first thing I look at is if it has a BAD lever on it. Why? Experience has taught me that this device can screw up a perfectly good working AR.



    C4

  9. #29
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    What kind of mags are you running, how old are they?

    Almost all of the bolt over base malfunctions I have seen, and that looks like one in the pic, are due to the magazine having issues.

  10. #30
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    Same issue here in a mid-length 14.5" Noveske upper (bolt override, failure to properly feed when dropping the release). However unlike the OP, my bolt will lock open on the BCG and not the Bolt-Face. Did the "short stroke test" and it either wouldn't lock open, or would lock on the BCG instead of the bolt-face.

    I even tried the GI spring and a Carbine buffer (vs the original Springco blue and H-buffer) but haven't solved the issue yet. The only "fix" was using a very short, apparently underpowered spring I found in a spare parts bin. The action seemed to cycle properly with this spring, but it was so weak that on a magazine change it wouldn't push the new round all the way into the chamber, and I had to actually use the charging handle on a mag change to give it enough force (to show how ridiculously weak the spring was).

    My problem may be that I've only tested with Wolf/PMC ammo. I'm disappointed though if it can't run this low-powered ammo even with a standard spring & buffer weight. Would the next step be to just test the standard spring & weight with military (M193/M855) ammo?

    I also followed Grant's advice and removed the BAD, but unfortunately the problem persists. I even tried different magazines - same problem.
    Last edited by Heidevolk; 02-19-12 at 15:18.

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