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Thread: Interesting BUIS Drop Test

  1. #31
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    Quote Originally Posted by Doc Glockster View Post
    I did get the idea that there might be issues with the polymer sight if your optic won't clear the sight even folded down, but I wanted to see if that was the main gripe or if it was something else, like deterioration of the mechanism due to egging out of pin and spring holes as a result of repeated spring activation, just as one possible example.
    I gotcha. Another reason is mounting to the rail gas blocks becuase of heat.
    I'll let them speak for if it was due to design of the polymer problems, or more just improvements and more benefits.

  2. #32
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    Quote Originally Posted by steyrman13 View Post
    I gotcha. Another reason is mounting to the rail gas blocks becuase of heat.
    I'll let them speak for if it was due to design of the polymer problems, or more just improvements and more benefits.
    Not that my friends are SME's, but the impression in the minds of a couple of them is that the polymer MBUS is for "keeping folded" and "seldom deployed." In other words, a true "backup" sight not to be trained with or used regularly.

    A good analogy might be that it's the equivalent of the plastic spare tire in most vehicles nowadays.

    I'm not saying I believe that's necessarily true, but that is the impression in the minds of some people.

    Based on the article I referenced, I purchased my first polymer MBUS yesterday.

    I haven't even taken it out of the package, but based on the cautionary tales of people I've spoken to, I would try to deploy it by gently releasing the lever while holding my finger on the spring tension, sort of like lowering the hammer with the receiver halves open.

    Whether that's a prudent way to use the sight or just novice-level namby-pamby-ism I was hoping MagPul would chime in and address.
    Last edited by Doc Safari; 09-05-13 at 17:05.

  3. #33
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    Quote Originally Posted by Doc Glockster View Post
    Not that my friends are SME's, but the impression in the minds of a couple of them is that the polymer MBUS is for "keeping folded" and "seldom deployed." In other words, a true "backup" sight not to be trained with or used regularly.

    A good analogy might be that it's the equivalent of the plastic spare tire in most vehicles nowadays.

    I'm not saying I believe that's necessarily true, but that is the impression in the minds of some people.
    I kind of agree to that idea. Technically though, any Folding sight is intended designed as a Backup (BUS/BUIS). I prefer ones that I don't want to use every time (BUIS/BUS) to be small and out of the way and not interfere with other things on the rail, charging handle, etc. I like DD fixed sights and I like KAC Micros for BUIS and magpul for less expensive alternative if the size and space is availble. Now the next BUIS will be the Magpul Pros....they fit the ideas of the KAC Micros at a much lower price.

  4. #34
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    If you think the test was something to scoff at, you should probably read the whole thing, not the abridged version on kit up.

    http://vuurwapenblog.com/2012/07/08/...tic-drop-test/

    One thing I did not mention in the post which was sent to KitUp (due to word count limitations) was that after dropping the MBUS twice, I picked the rifle up, held it over my head like the maul I used to split seasons' worth of firewood while growing up in Alaska, and swung it down on a concrete shooting table, with the MBUS taking all of the impact. It did not break or shift POI by anything more than 1MOA.

    Also I will never buy Troy's again, not just because of this test, but because Ive actually had the locking detents fall out of the sight after ~2k rounds. Not to mention their hiring practices.
    Last edited by vicious_cb; 09-05-13 at 20:19.

  5. #35
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    Quote Originally Posted by vicious_cb View Post
    If you think the test was nothing to scoff at, you should probably read the whole thing, not the abridged version on kit up.

    http://vuurwapenblog.com/2012/07/08/...tic-drop-test/

    One thing I did not mention in the post which was sent to KitUp (due to word count limitations) was that after dropping the MBUS twice, I picked the rifle up, held it over my head like the maul I used to split seasons' worth of firewood while growing up in Alaska, and swung it down on a concrete shooting table, with the MBUS taking all of the impact. It did not break or shift POI by anything more than 1MOA.
    He did mush up one of the protective ears, though. Can't have that can we?

    (I think you meant to say "if you think the test was something to scoff at...").



    Also I will never buy Troy's again, not just because of this test, but because Ive actually had the locking detents fall out of the sight after ~2k rounds. Not to mention their hiring practices.
    It's not widely disseminated on this forum, due to the mass consumption of Troy Kool-Aid among some members, but in my thread asking "What's your favorite BUIS?" there are rumblings of people dissatisfied with the fact that the Troy apertures have no positive retention in either aperture position, leaving people to constantly "police" their BUIS for proper aperture alignment. I noticed that the PRI rear sight lacks this positive retention also, and would probably suffer the same fate.

    Either way, neither the Troy nor the PRI rear BUIS will sit on one of my rifles just because of this issue.
    Last edited by Doc Safari; 09-05-13 at 17:40.

  6. #36
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    You can pretty much run the Gen 2 MBUS like you stole them. I am unkind to them, to be mild, and have never had a single issue. If you bought them off E-Bay or other non-firearm related outlet...your results may vary. The MBUS is WIDELY counterfeited, and most of the returns we receive are from people who unknowingly bought fakes. Buy from trusted vendors and fear not.

    Run them like any other sight. They do not need to be babied. Any folding sight will, however, be stronger in the stowed position, so you just have to make a judgment of how quick you want to be able to transition vs how cautious you want to be against accidentally throwing your rifle off a cliff. :-)

    If I am running an EoTech, my front is always up, and my rear is usually down. With an aimpoint, ACOG, or a low-powered variable, I generally leave both down, maybe have front up with Aimpoint for close stuff. Doesn't matter to me what they're made of. YMMV.
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  7. #37
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    Quote Originally Posted by Doc Glockster View Post
    He did mush up one of the protective ears, though. Can't have that can we?

    (I think you meant to say "if you think the test was something to scoff at...").





    It's not widely disseminated on this forum, due to the mass consumption of Troy Kool-Aid among some members, but in my thread asking "What's your favorite BUIS?" there are rumblings of people dissatisfied with the fact that the Troy apertures have no positive retention in either aperture position, leaving people to constantly "police" their BUIS for proper aperture alignment. I noticed that the PRI rear sight lacks this positive retention also, and would probably suffer the same fate.

    Either way, neither the Troy nor the PRI rear BUIS will sit on one of my rifles just because of this issue.
    I dont use that saying often, thats pretty obvious. Anyway I guess thats why they're called protective ears. I use the KAC 2-600m rear and a FSB but I would not to hesitate to use the mbus and I have configured friends guns with them.
    Last edited by vicious_cb; 09-05-13 at 20:21.

  8. #38
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    Although not "in style" now, the ARMS sights are pretty rugged, I've seen them on guns that take constant beatings and they are still working.
    GET IN YOUR BUBBLE!

  9. #39
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    Quote Originally Posted by SPQR476 View Post
    You can pretty much run the Gen 2 MBUS like you stole them. I am unkind to them, to be mild, and have never had a single issue. {snip}

    Run them like any other sight. They do not need to be babied. Any folding sight will, however, be stronger in the stowed position, so you just have to make a judgment of how quick you want to be able to transition vs how cautious you want to be against accidentally throwing your rifle off a cliff. :-)


    {snip} Doesn't matter to me what they're made of. YMMV.
    Good to know. I just installed a polymer MBUS on my shooter, so that tells you I have quite a bit of confidence in it now. I would never knowingly install something I had significant doubts about.

    I plan to leave mine stowed. My whole reason for wanting a folding BUIS in the first place is because I decided a fixed sight was too cluttered in low light.

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