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  1. #1
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    Guide for assorted rear BUIS

    Weapon System: AR15/ M16

    Manufacturer:

    Atlantic Research Marketing Systems INC/ ARMS

    Lewis Machine and Tool/ LMT

    Precision Reflex Inc./ PRI

    Troy Industries

    Yankee Hill Machine/ YHM

    GG&G

    Midwest Industries

    C4 Diopter HK Style Iron Sights

    Knights Armament Co

    www.magpul.com




    Item Installed: Rear Back Up Iron Sight (BUIS)



    Purpose of Item: Iron sights have been supplemented by a broad variety of optics, both electronic and magnified. However, any serious weapon needs to retain some form of Back Up Iron Sight (BUIS) in case of optic failure. Anyone who has had an optic failure in a real world event becomes semi-religious in their convictions, or at least I have.

    Back Up Iron Sights come in two main styles. The first is the type that folds. This allows the end user to see over the unit, though it requires the user to deploy the BUIS in event of primary optic failure. The second type is a fixed rear sight. This style is obviously quicker to use if the primary optic fails, though it does tend to require a little more training to see "through" the fixed sight.



    Tools Needed: A variety of fastening methods are used, tools needed may be an allen head wrench, a flat head screwdriver, or coin.




    Items Included: Most BUIS will require a tool to install, this is usually a requirement that the installer/ owner will need to produce.
    Last edited by Stickman; 17 November 2008 at 18:41.

  2. #2
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    ARMS

    The ARMS 40 family has several different variants. The ARMS 40L shown below is the basic low profile BUIS. It has two different apertures, and is under constant spring tension. To raise the sight into position, you pull back on the release bracket (located on the right side). The internal spring launches it into position, and holds it in place through spring tension. To retract the unit, press rearward on the sight body, and thumb the release bracket back back into place.












  3. #3
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    PRI

    The PRI BUIS shown below has two different apertures. It is raised into place manually, and locks into position. It is retracted by pressing the release button, and pulling the sight body flat against the receiver.















  4. #4
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    TROY

    The Troy BUIS shown below has two different apertures. It is raised into place manually, and locks into position. It is retracted by pressing the release button, and folding the sight body flat against the receiver.















  5. #5
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    LMT

    The LMT BUIS is a fixed BUIS that replicates the traditional carry handle of the M4.









  6. #6
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    GG&G

    The GG&G BUIS is released via a push button located on the left side of the BUIS body. This model uses a standard dual aperture. GG&G also has an older sight body which looks similar, but is not spring activated. The easiest way to tell the difference is the lack of the push button on that sight body.











  7. #7
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    Magpul Back Up Sight (MBUS)












  8. #8
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    KAC Micro Flip Up 200-600 Meter BUIS. This folding sight is adjustable for windage and elevation, and retails for $125.












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