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Thread: KAC BUIS

  1. #1
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    KAC BUIS

    First off, the search function has not been working for me for two weeks now. It hasn't worked with Google Chrome or with Firefox so I haven't been able to research this myself.

    I'm looking to get a different BUIS for my next build. I KAC's simplistic design but most important to me is the small sight aperture.

    My conern with the KAC sights is the windage and elevation knobs being too easily moved though accidental bumpage while the weapon is and the slight itself being accidentally flipped up while slinged. This is the one I'm considering:



    I was considering the 200-600m version, but may stick with the 300 (no elevation adjustment) model if the elevation adjustment is too prone to moving.



    I see they offer a micro version of each, which has a smaller windage knob that may or may not be more resistant to accidental movement.





    Does anyone have anything to say about these sights?

    Like I said, my main concern is having the adjustment knobs inadvertently moved, thus messing up my zero. They also look like they may be prone to easily getting flipped up (like the Army issue BUIS) if they snag on something. If it weren't for the fact that it is difficult to find a good BUIS with a small sight aperture I would be looking elsewhere. Does anyone have any input?
    a former meatpuppet.

    http://sixty-six.org

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    Looks fragile. If you are using your buis, then you are already having a bad day. A fragile buis would seem to be a bad choice.

  3. #3
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    It's absolutely NOT fragile.

    They're good to go, and they do require a conscious pull 'up' to get them locked up, the dials are also FIRM, so even rubbing against gear they're very unlikely to change windage or elevation.

    They also lay flush with the receiver so again it'd take a lot of accidentally snag them and pull them up.

    I've got a 200-600m version on my SR-15, and a micro version on another gun, and both sights are absolutely good to go.
    "There he goes. One of God's own prototypes. Some kind of high powered mutant never even considered for mass production. Too weird to live, and too rare to die."

  4. #4
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    One of the weak points of this site, IMHO, is the search function. It won't work with short words like "KAC", which really impairs its function.

    I usually go to google and type this "site:m4carbine.net" plus whatever you want to search for.

    Example:http://www.google.com/search?hl=en&c...&aq=f&oq=&aqi=
    Last edited by NMBigfoot02; 09-19-09 at 13:25.

  5. #5
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    Quote Originally Posted by Titleist View Post
    It's absolutely NOT fragile.

    They're good to go, and they do require a conscious pull 'up' to get them locked up, the dials are also FIRM, so even rubbing against gear they're very unlikely to change windage or elevation.

    They also lay flush with the receiver so again it'd take a lot of accidentally snag them and pull them up.

    I've got a 200-600m version on my SR-15, and a micro version on another gun, and both sights are absolutely good to go.
    Awesome, that's what I wanted to hear, thank you.


    I ususally go to google and type this "site:m4carbine.net" plus whatever you want to search for.
    Thanks for the tip. The search function on this site really does need to get overhauled.
    a former meatpuppet.

    http://sixty-six.org

  6. #6
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    Quote Originally Posted by alistaire View Post
    Looks fragile. If you are using your buis, then you are already having a bad day. A fragile buis would seem to be a bad choice.
    It is absolutely not fragile.
    Ever used one?
    OP:
    While it may seem that the knobs are exposed and may be easily moved, they are not. The one I used was maybe a little stiffer than an A2 windage knob. The elevation mechanism wasn't that easily moved either, although it has been a while since I messed with one.
    I'm considering putting some KAC sights on a new build myself, and I like them although I have not used the micro versions.
    Last edited by m24shooter; 09-19-09 at 12:56.
    Death hangs over thee: whilst yet thou livest, whilst thou mayest, be good.

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    Fragile it is not the full size versions are issued to the military and on the sopmod block 2 i have both rear sights 300m and the 300/600m sight well worth the money i have never had a kac product that was not worth it

  8. #8
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    You don't have to worry about the windage knob being accidentally rotated. If you want to be overly cautious, and this is just good practice anyways, you can use a paint pen to mark witness lines on the windage knob so that even if it is inadvertently moved/rotated a few clicks, you can easily see that it has been moved and can easily adjust it back to where it was when you zeroed it before.

    Also, if you're definitely going to go with the KAC BUIS, I'd get the micro version(s) if I were you. They are cheaper and smaller, which is usually a winning combo when it comes to BUIS, optics, etc... Just my opinion, YMMV.

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    At 125$ retail the 600m micro is a great choice. The windage knob will not rotate by accident. We really worked hard to bring this sight to market and still be competitive in the com. market without comprimising our quality standard. Look for more products to come along these lines.

    Fragile? I can't say i have ever seen a broken rear sight for the 10s of 1000s we have put in the field. Part of the theory of the sight not locking in the up position I'm sure has led to that kind of a success rate.
    C Reed Knight III
    Knight's Armament Co.
    http://www.knightarmco.com/

  10. #10
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    Quote Originally Posted by motorolahamm View Post
    Fragile it is not the full size versions are issued to the military
    That sounds like the general consensus. I'll have to check one out.

    On a side note, simply because something is issued to the military does not make it a good piece of equipment.
    Last edited by panzerr; 10-05-09 at 14:55. Reason: sp
    a former meatpuppet.

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  11. #11
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    I agree but when you put product out there in that kind of numbers and don't get negative feedback you know things are right. If you put a piece of crap product in soldiers hands you hear about it ,.... quick. Those guys can break a hammer with a rubber anvil.
    C Reed Knight III
    Knight's Armament Co.
    http://www.knightarmco.com/

  12. #12
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    Quote Originally Posted by III View Post
    At 125$ retail the 600m micro is a great choice. The windage knob will not rotate by accident. We really worked hard to bring this sight to market and still be competitive in the com. market without comprimising our quality standard. Look for more products to come along these lines.

    Fragile? I can't say i have ever seen a broken rear sight for the 10s of 1000s we have put in the field. Part of the theory of the sight not locking in the up position I'm sure has led to that kind of a success rate.
    III,
    Whats the folded height of the KAC BUIS's?
    -Be without fear in the face of your enemies.
    -Be brave and upright that God may love thee.
    -Speak the truth always,even if it leads to your death.
    -Safeguard the helpless and do no wrong.

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  13. #13
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    Quote Originally Posted by III View Post
    At 125$ retail the 600m micro is a great choice. The windage knob will not rotate by accident. We really worked hard to bring this sight to market and still be competitive in the com. market without comprimising our quality standard. Look for more products to come along these lines.
    Mr. Knight,

    Are the Micro versions of your sights replacing the older style or will they be offered in addition to the older style?

    Thanks,
    Jason

  14. #14
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    Not III here, but...

    Blankwaffe, I haven't measured the folded height of the two versions of the micro BUIS (I have both of them), but they are definitely the lowest profile BUIS I have ever seen, that's for sure. You will not find another BUIS that is more out of your way and unnoticeable than the KAC micros.

    RAM, as of right now both versions, the micro and the standard size, of BUIS have been on the market for a while, so I would assume that they are keeping both of them, but that's just an (un)educated guess on my part. I would also assume that the market would drive those decisions.

  15. #15
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    RetreatHell thanks for the comments; Kevin or I will get an actual measurement up next wk and perhaps a side view of the two sights folded for comparison. You can kind of see the difference in the above pictures. The post is the same and you can see how much more post is exposed on the micro showing the difference in height when folded. Yes we will keep the older sights in production. They are under contract , have NSNs ,and are used on our rifles that are under contract and have NSNs. Even the RIS is still in production and avail even though it has been replaced for the most part by the RAS which has known better performance.
    Last edited by III; 10-03-09 at 21:41.
    C Reed Knight III
    Knight's Armament Co.
    http://www.knightarmco.com/

  16. #16
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    Quote Originally Posted by Blankwaffe View Post
    III,
    Whats the folded height of the KAC BUIS's?
    Folded height of the original P/N: 98474 (NSN: 1005-01-499-6868) 200-600M model is .470".
    Don't have a Micro here at home yet to measure for you today because all we have made to date were reserved for commercial/military customers.
    The Micro height is a little less.
    ColdBlue sends...
    (CB is David A. Lutz, Lt. Col. USMC (Ret'd) (1968-1991)
    VP MilOps @ Knight's Armament Company (KAC) (1994-2012)
    "...if you can read this, thank a Teacher,
    if you are reading this in English, thank a Veteran..."

  17. #17
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    The KAC BUISs are some of my most used. The only problem I have with the rear BUIS is that the securing screw on the port side of the sight interferes with the the locking lever of a LaRue scope mount. It would be great if you redesigned the sight so that the screw is flush to the sight body as on the Troy mounts.





    Some more KAC pron . . .




























    And of course the perfect mate for the KAC rear BUIS . . .






















    Last edited by Molon; 10-04-09 at 11:45.
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  18. #18
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    Outstanding fella's.I very much appreciate the information and especially the mounted pictures.I have right at .500" under my optic and was looking for a BUIS that did not crowd the CH requiring a TAC latch.Looks like either of the KAC BUIS's should work for my needs.
    -Be without fear in the face of your enemies.
    -Be brave and upright that God may love thee.
    -Speak the truth always,even if it leads to your death.
    -Safeguard the helpless and do no wrong.

    A government big enough to give you everything you want is a government big enough to take from you everything you have. Gerald R. Ford

  19. #19
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    Quote Originally Posted by Blankwaffe View Post
    Outstanding fella's.I very much appreciate the information and especially the mounted pictures.I have right at .500" under my optic and was looking for a BUIS that did not crowd the CH requiring a TAC latch.Looks like either of the KAC BUIS's should work for my needs.


    The micro is really worth checking out. I am a fan of the smaller adjustment knob on this little beast.





    Stick


    I have been asked to point out that I am Magpul's photographer. I have also done work for 95 or so manufacturers within the firearm community, my work has been used for web, catalog, banners, magazines, covers, etc. I have also shot work for the US Military where it has been used in training aids. I am prior service and a full time LEO.


    I also shoot and write for Military Times. My primary focus is weapons, accessories and related equipment reviews. Manufacturers can reach me through any of the boards. If you have something new, let me know.



    Newest pictures uploaded here at my Flickr account

  20. #20
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    Thanks Stickman.The micro is what Ive been looking for.The overall profile is about as "out of the way" as I could ask for.
    -Be without fear in the face of your enemies.
    -Be brave and upright that God may love thee.
    -Speak the truth always,even if it leads to your death.
    -Safeguard the helpless and do no wrong.

    A government big enough to give you everything you want is a government big enough to take from you everything you have. Gerald R. Ford

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