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Thread: Critical Failure - Seeking Advice

  1. #21
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    Go & No Go gages are a pointless and the field gage is questionable considering it can mathematically fit in a "Go" chamber and still be safe. If someone were just dying to spend money on a headspace gage, the MAX/REJECT at 1.4736 is really the only one you need.

  2. #22
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    I'm fine, someone else was shooting it. I suspect that there were several factors that limited the damage. The Vltor MUR upper and the LMT enhanced carrier probably helped it. The lower is good thank (insert Deity here).

    Quote Originally Posted by Heavy Metal View Post
    SBR? I double hope your lower is fully intact Gunz.



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  3. #23
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    Quote Originally Posted by Heavy Metal View Post
    SBR? I double hope your lower is fully intact Gunz.
    First thing that came to my mind as well.
    Steve

  4. #24
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    Happy Ending

    OP and Iraqgunz, I have noticed over the years that most "lessons" involve some sort of pain, whether it's physical, mental or monetary.

    Glad to see that you guys are more in the monetary than either of the other two.

    This thread struck me as a reminder of the inherent dangers of our hobby and I'm glad to see it didn't have a more painful ending.
    "Why "zombies"? Because calling it 'training to stop a rioting, starving, panicking, desperate mob after a complete governmental financial collapse apocalypse' is just too wordy." or in light of current events: "training to stop a rioting, looting, molotov cocktail throwing, skinny jeans wearing, uneducated bunch of lemmings duped by, or working directly for, a marxist organization attempting to tear down America while hiding behind a race-based name"

  5. #25
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    Agree on Go and No-Go gages. There doesn't seem to be any consistency in the headspace they measure, they're just made to some manufacturer's arbitrary dimension between the accepted max and min. A true Field gage does measure the max 1.4736 dimension though.

    Quote Originally Posted by MK18Pilot View Post
    Go & No Go gages are a pointless and the field gage is questionable considering it can mathematically fit in a "Go" chamber and still be safe. If someone were just dying to spend money on a headspace gage, the MAX/REJECT at 1.4736 is really the only one you need.
    B.A.S. Mechanical Engineering Technology

  6. #26
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    I'm more of an AK guy, and when building a gun headspacing is a very critical part of the process. In the AR world it's more of a "use the force" mentality it seems. People just expect that the stuff will be in spec and assemble their uppers from parts made by a dozen different companies. This thread reminds me that I need to get some 5.56 gauges. Glad everybody was unhurt.

    ETA - Btw I'm not being snarky at all. I have no idea if the ammo was the culprit, it very well might have been. My post was more to say that verifying headspace is just one more line of defense in the struggle to ward off catastrophic failures.
    Last edited by Peshawar; 07-06-13 at 21:48.
    Crossing the Noobicon

  7. #27
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    Quote Originally Posted by awpk03s View Post
    The third round, detonated before the bolt carrier was fully seated and the bolt fully rotated back in place The bolt itself was fully engaged in the lugs of the barrel, however, as I said, it detonated prior to full BCG seating.
    Curious how you determined it fired before the carrier was fully seated?

    Unless you had a high primer or out of spec (super long) firing pin this should not be possible. (at least as I understand the AR design and my hands on testing)

    Wonder if the carrier stuck partly in recoil, but stopped because the case was stuck??? Tore the rim off trying to pull it out? That makes more sense to me.

    Also, did you by chance chamber the cartridge more than once? Test cycling, that type of thing? (Partial firing pin strike issue).

    Sinister, I'm curious about your photo's. Normally excessive headspace failures show thinning in the web, which leads to the failure. If it stretches, it pretty much has to get thinner. Also the cases are measurably longer when measured at the shoulder, etc.

    Your photo's look to me like super high pressure. I'm sure you have more data/specifics, just jumped out at me that the web was not thinner from stretching.

    If the OP's issue is excessive headspace it should be easy to determine by measuring the brass. Everything I see indicates excessive pressure from cartridge mfg (let's hope not), bullet jammed in lands from miscut throat or too long, partial barrel blockage from squib, or something. But that's just me commenting on internet photos.

    First thing I'd do is measure some fired brass from the problem rifle with a comparator on the shoulder vs unfired vs known good fired.

  8. #28
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    If the gun was out on headspace, examination of the previously fired casings would show it.
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

  9. #29
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    Curious how you determined it fired before the carrier was fully seated?
    He didn't, he is making an incorrect assumption based on the appearance of the case.
    Last edited by Heavy Metal; 07-06-13 at 23:01.
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

  10. #30
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    Quote Originally Posted by Singlestack Wonder View Post
    Rubber City Armory....
    I'll bite...how is this their fault? They are replacing the bcg for free. What exactly are you trying to imply?

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