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Thread: Testing Gas Rings

  1. #21
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    Okay... Just tested the Young bolt in the following carriers: LaRue (hard chrome), Spikes nickel boron, and a very old Bushmaster (SA). The Young bolt collapsed with all of them. Conversely the bolts from those carriers did not collapse in the Young carrier.

  2. #22
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    Quote Originally Posted by El Cid View Post
    I guess the next test will be to see if the new rings wear out in another 500 rounds.

    They're worn out when the rifle short strokes, otherwise you're seeing an indicator of wear. Do you have a dental pick?

  3. #23
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    Quote Originally Posted by Tweak View Post
    They're worn out when the rifle short strokes, otherwise you're seeing an indicator of wear. Do you have a dental pick?
    Don't have dental tools. My concerns are 1) they wore out so quickly that they fail the test as 500rds is too quick IMO. and 2) This rifle currently serves the HD role so waiting until it short strokes isn't really an option.

  4. #24
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    "I have never heard of the test you describe as being a reliable way to test gas rings.
    Wow. That reads like somebody has their nose so high in the air that they're indanger of drowning during the rainy season....

    Point of order: I saw nothing to indicate you asking him what he's heard of.....but as to whether or not the method is a workable one. If he's got a technical knowledge base worth pissing on if its on fire, he'd be able to tell you why it wouldn't be reliable/workable/helpful.

    Since he didn't do that, it's either an somewhat-artful dodge....or his knowledge base is too narrow or shallow to be worthy of basing any actions or decisions.

    One thing about the written word; you really don't have an excuse for being incomplete, unless it's what you're going for in the first place, or somehow just can't bring one's self to type out "I don't know."

    And I dunno about the rest of you.....I don't own any MOLLE pouches for a damned air compressor and ancillary equipment. If there's no field-expedient method to test the wear rate of gas rings that he'd consider viable, why not just SAY so?

    This joker came up with his own question to answer, instead of answering the one that was asked. Jeez, they're EVERYwhere....FML.
    Contractor scum, AAV

  5. #25
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    On the carrier questions, yes. That is, in talking with various manufacturers, I've discovered that the surface smoothness of the interior is an important detail.

    A rough surface will eat gas rings, and there is no fixing it. "Manufacturers" who try to skip steps, or come "close enough" will make troublesome parts. In some applications, that isn't a big deal.

    In this instance, were I faced with a 3-gun rifle that worked 100%, shot sub-MOA groups, and ate gas rings in 500 rounds, I'd just spend the extra buck-and-a-half every 400 rounds, and not sweat it. A rifle for the zombie apocalypse, I'd swap out the carrier for one that was more gentle on gas rings.

  6. #26
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    It seems that the general consensus is that, aside from the possibility the gas rings are soft (I've seen a couple sets that wore down exceptionally quickly for no apparent reason) or that you're not using proper lubrication, that something is probably wrong with the carrier... either it is too rough inside and is causing premature wear or the inside diameter is too great.

    ..... I replacement bolt carrier group that is actually built to spec is less than $150. If you're considering this rifle for defensive use, I think I'd upgrade to a bolt carrier group that is actually in spec.

  7. #27
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    It isn't for lack of lube. I use it liberally all the time. Right now the plan is to replace the rings and see if it happens again.

    Is there any possibility the rifle is over gassed and causing excessive wear? It's a Lilja M4 Patrolman bbl and Brownells low profile gas block.

    Thanks again!

  8. #28
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    Quote Originally Posted by El Cid View Post
    It isn't for lack of lube. I use it liberally all the time. Right now the plan is to replace the rings and see if it happens again.

    Is there any possibility the rifle is over gassed and causing excessive wear? It's a Lilja M4 Patrolman bbl and Brownells low profile gas block.

    Thanks again!
    I've personally never known over-gassing to wear out gas rings exceptionally quickly, although I imagine it could happen. Usually over-gassing is revealed by excessive gas back into your eyes/nose, and issues with torn casings. That said, I am not the end-all be-all of knowledge...

    Even if it isn't causing the rings to wear... doesn't hurt to have an idea. Look where your brass is ejecting... If it is beyind 3 o'clock, you're running a little sluggish. If it is ahead of 3 o'clock, you're cycling too fast. Doesn't necessarily tell you whether you are over-gassed or not since this also takes into account buffer weight, spring tension, and ammunition... but you'll at least know that your cyclic rate is about right.

    (Yes, this is very field-expedient... and for those of us with no high-speed camera.)

  9. #29
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    Quote Originally Posted by lamarbrog View Post
    If it is beyind 3 o'clock, you're running a little sluggish. If it is ahead of 3 o'clock, you're cycling too fast.
    Not this again....


    http://m4carbine.net/showthread.php?...le#post1102317

  10. #30
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    Quote Originally Posted by DeltaSierra View Post
    Hmm... Interesting. Didn't know how it got started, but I heard it a few years back (never saw this illustration) and have been using it ever since and it's never failed me yet.

    Passes the smell test to me. I'll keep using it.

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