View Poll Results: Colt or LMT?

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  • Colt

    85 55.92%
  • LMT

    67 44.08%
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Thread: 6920 or LMT "the standard"

  1. #31
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    Quote Originally Posted by GONIF View Post
    I was unaware of that and would count on Rock to build a great barrel,after all he was trained by Boots Obermirer(spelling) and that old man was one of the best. in any event I have not found any of my 6 Colt rifles to be lacking in any way includeing accuracy and duribility. ther large pins and sear blocks (in 2 of them) are a drag ,but otherwise they are top notch . the fact that my 6920 and MT6400c shoot as accuratly as my LMT lead me to belive they both are top quality barrels and equal in that department . I will keep an eye on it and see if a few thousand rounds more alter my opinion of Colt or LMT.
    generally speaking, both lmt and colt m4 bbls are capable of very good accuracy. However, bench resting with a higher power scope will show a general tendency towards the LMT being the more accurate of the two bbls.

    but in all seriousness, benching them would probably be the only time that difference is apparent.

  2. #32
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    I wonder where the BCM barrel is made and by who and how thiers is made . I a'm going to try the BCM,LMT and Colt on a bag and use a Nikon X 4-16x50 on them and see what happens . all with some Black Hills 77 grain 5.56 Tap . this will be a pain in the A$$ mounting the scope on each ,but should tell the tale.
    WHO ME ? ---- A government big enough to
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    you have.
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  3. #33
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    Quote Originally Posted by GONIF View Post
    but should tell the tale.
    One example of each is far from a statistically valid sample size, even if all the unintentionally imposed variables could somehow be eliminated.

    But it should be fun.

  4. #34
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    Cool

    Quote Originally Posted by ARin View Post
    please dont make comments like this if you really dont have a clue what you are talking about. thanks in advance.


    my assertion has nothing to do with park under the sight base or pins.

    it has to do with the blanks that LMT uses.

    LMT uses barrel blanks from Rock creek bbls (Mike rock), that are upbored to accept the additional thickness of chrome. giving us only one poor tolerance, and no stacking.

    TDP calls for electro etching to open up 5.56 bores, then chroming them back down to 5.56 spec. Neither electro etching nor chrome lining are exact processes, giving us a stack of two poor tolerances.

    This electro-etch process dates back to vietnam era m16's, that were originally non chrome lined.

    this information has been verified by several sources, including LMT directly and barrel experts including randall rausch (ar15barrels.com).
    Oh man, you just can't beat a Colt Vs. thread. And Arin, just gets better and better.

  5. #35
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    Quote Originally Posted by spamsammich View Post
    Tapered pins are used because they are relatively easy to install for mass production and maintenance, i don't necessarily think they are better in terms of performance. They are just part of TDP.
    I know this is a side topic but....

    Randall's opinion differed on this subject. Straight pins are simpler to manufacure. And the Taper pins actually pull the FSB down onto the top of the barrel as they are driven in to create the critical seal for the gas port. They are part of the TDP for a reason.

    (I'm paraphrasing Randall's posts, but I think that was the gist of it)
    "You people have too much time on your hands." - scottryan

  6. #36
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    Quote Originally Posted by ARin View Post
    Neither electro etching nor chrome lining are exact processes, giving us a stack of two poor tolerances.
    I just threw all my COLT barrels into Tempe Town Lake!

    Seriously though... I see what you're saying with the tolerance stacking. But there must be a quality check of some sort no? A min/max, or a threshold of unacceptablity?
    "You people have too much time on your hands." - scottryan

  7. #37
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    Quote Originally Posted by demigod View Post
    A min/max, or a threshold of unacceptablity?
    At a bare minimum you could use a GO/NO-GO gauge. Though I am pretty sure the chamber is specified graphically in the military specification.

    While the LMT process may be superior in regards to tolerance stack, it will either conform to the mil-spec (LMT or COLT) or it won't. Period.

    It would be like saying a perfectly concentric hole that is accurate to +/- 0.003" but was Wire EDM'ed is less accurate, or somehow "better", then a perfectly concentric hole that is accurate to +/- .003" but was cut using a mill.

  8. #38
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    Quote Originally Posted by demigod View Post
    I know this is a side topic but....

    Randall's opinion differed on this subject. Straight pins are simpler to manufacure. And the Taper pins actually pull the FSB down onto the top of the barrel as they are driven in to create the critical seal for the gas port. They are part of the TDP for a reason.

    (I'm paraphrasing Randall's posts, but I think that was the gist of it)
    Yeah, they most definitely act as a wedge, this is what makes them pretty much self aligning and easier to work with. I can see the point he was making there. A properly sized straight pin is relatively difficult to use for repeated maintenance since it can be difficult to start.

  9. #39
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    Quote Originally Posted by demigod View Post
    I just threw all my COLT barrels into Tempe Town Lake!

    Seriously though... I see what you're saying with the tolerance stacking. But there must be a quality check of some sort no? A min/max, or a threshold of unacceptablity?
    I think there is an air gauge check they can do. Kinda like a leakdown test on a cars engine.

  10. #40
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    Ordering a complete rifle

    FWIW, I ordered a complete gun from LMT through Walker Precision.

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