Results 1 to 15 of 15
  1. #1
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0

    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 19:41.

  2. #2
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    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
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    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
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    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
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    LMT

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









  6. #6
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    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
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    YHM

    The YHM BUIS is a basic unit that has a cost of roughly half that of many other BUIS. It is manually raised and lowered. It locks into position, and to retract the sight, you press down on the button, then fold it flat.

    NOTE- In this picture, the side clamp of the YHM BUIS is not fully engaged into the side of the upper receiver. This is not an issue with the BUIS. I borrowed the BUIS for the pictures, and didn't tighten it down enough to lock it in position.












  8. #8
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    C4 Diopter HK Style Iron Sights

    The C4 Diopter HK Style Iron Sight is a non-folding rear BUIS that replicates the rear sight of the HK MP5. It has 4 different apertures, with the fourth being a notched "V" sight. This BUIS is attached to the rail with a phillips head screw, and loctite would be a good method of helping to keep it fastened tightly.






  9. #9
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    Midwest Industries

    The MidWest Industries BUIS is manually raised and locked into position. The button on the left side releases the lock, and allows for the unit to be folded back into its flat/ stowed position. The standard A2 aperture and adjustment knob should be familiar to most shooters. The MI BUIS attaches to the rail via an allen head screw, and as with all other BUIS, loctite or a similar thread locker should be used to prevent it from loosening.








  10. #10
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    CAR-15/M4 360 HK STYLE FLIP-UP SIGHTS

    The Brownells folding rear BUIS replicates the HK stlye sights. There are individual settings for 100, 200, and 300 yards, as well as a larger "combat" style aperture. A large attachment nut on the side allows for secure adjustment with a coin, blade, or wrench.


    I'll update this with similar pictures to the others as soon as I get a chance.







  11. #11
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0

    Midwest Industries has released their new Back Up Iron Sight (BUIS).

    Features

    * Same plane low profile back up rear iron sight

    * .4375" when folded flat

    * Large detent with large surface area for increased strength

    * Micro windage adjustment knob with standard MOA adjustment

    * Locking stepped detent button for increased texture in wet/ cold conditions








  12. #12
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    KAC


    KAC Flipup rear sight 200-600 meter.

    NSN- 1005-01-499-6868











  13. #13
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    Yankee Hill Machine has released a new line of spring loaded BUIS. These sights are raised by pressing a button on the left side of the sight, and are spring driven into their locked upright position. Lowering the sights requires the user to press the button, and fold the sights back into their stowed position.

    The rear sight uses a standard M16 aperture.













  14. #14
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    Magpul Back Up Sight (MBUS)












  15. #15
    Join Date
    Jun 2007
    Posts
    5,554
    Downloads
    0
    Uploads
    0
    KAC Micro Flip Up 200-600 Meter BUIS. This folding sight is adjustable for windage and elevation, and retails for $125.












Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •