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Using a 1-4x scope with BUIS

Discussion in 'Rifle Country' started by Mags, Mar 17, 2010.

  1. Mags

    Mags Well-Known Member

    Before I pull the trigger on a 1-4x AR scope is it possible to get a decent co-witness with BUIS with the scope set on 1x? My two concerns are the length of the scope tube could give you a tunnel effect and what heigth of a ring gives a good cowitness with 1-4 type scope? If using BUIS with the scope mounted is not an option I would consider mounting the scope with a quick release mount.
  2. Uncle Mike

    Uncle Mike Well-Known Member

    I can't....
  3. Mags

    Mags Well-Known Member

    What is that supposed to mean?
  4. Avenger29

    Avenger29 Well-Known Member

    I'm 99% sure you can't do that with a scope, even set on 1x. Only optics such as Aimpoints/Eotechs...

    A QR mount is the way to go, with folding BUIS. You know, I'm sure, of LaRue, ADM, etc...
  5. Uncle Mike

    Uncle Mike Well-Known Member

    It means the 1-4X25mm scope I have on one of the AR's will not co-witness the sights, front or rear...and the height of the sights are in the center of the scope.

    The front sight looks like it is a ghost! Booooo!
  6. raz-0

    raz-0 Well-Known Member

    The nature of the optics won't permit you to. Your front sight will basically look like you are staring at it from a couple inches away and it will be large and out of focus. How bad that is depends on how big your objective lens is on your scope, and how close it is to your front sight.

    Co witnessing only works with red dot style scopes.
  7. Mags

    Mags Well-Known Member

    Thanks fellas, guess I will just get a QD mount.
  8. wnycollector

    wnycollector Well-Known Member

    I'm glad I read this thread! I had planned on using a DNZ one piece mount to put a Millet 1x4 designated marksman scope on an AR with BUIS that I'm planning on building this spring! It looks like I need to stop over to the Larue website and check out the QD mounts.
  9. raz-0

    raz-0 Well-Known Member

    The american defense recon-x mount works well with that scope as well. I've been using that combo for a while now. My friend is using an spr-e and having some issues getting it far enough forward. I think he just has to readjust the diopter, but it's enough to have him complaining a bit.
  10. Maverick223

    Maverick223 Well-Known Member

    That is the way to go, the reason it won't work it because of the curvature of the glass...basically because it is a lens rather than a flat piece of glass like a holosight or typical red dot. It is also the reason that an optic gathers more light than the naked eye (with good glass quality, coatings, good grind on the glass).

  11. wnycollector

    wnycollector Well-Known Member

    Thanks for the tip on the mount. Can I assume that you like the millet DMS?
  12. DMK

    DMK Well-Known Member

    That's interesting. I've used 1x-4x variables on my AR15s and always wondered why the front sight block was slightly magnified at 1x. I just figured that my scopes didn't have a true 1x.
  13. Maverick223

    Maverick223 Well-Known Member

    That is often times the case as well. I am going out on a limb here, but I don't believe a true 1x is in existence. I have seen good scopes that were advertised as being 1x and they too would not allow you to focus on the front sight.

    FWIW, there is a Bushnell Trophy 1-4x in the buy, sell, trade: accessories if you're interested. Not mine, so you won't hurt my feelings, but figured I'd mention it.

  14. Zerodefect

    Zerodefect Well-Known Member

    Night force and Trijicon have true 1X scopes. The Accupoint that I borrowed when aimed at a fence with both eyes open it was a straight line through my field of veiw. At least it was so close to true 1X as far as my rusty eyes could see.

    But the scope is focused on the target. So the front sight is still blurry. Need a QD mount for BUIS use.
  15. HorseSoldier

    HorseSoldier Well-Known Member

    My Horus Talon is a true x1-4 as well, if I'm not mistaken, but it also won't cowitness back up irons effectively.
  16. Maverick223

    Maverick223 Well-Known Member

    That may be, but I just can't see how they would get the grind right to still capture more light and go down to a true 1x (however there are plenty that are about 1.05x or 1.1x). Either way, I have never seen one that allowed a focused view of the front sight.

  17. Bily Lovec

    Bily Lovec Well-Known Member

    the odds of using the BUIS are between slim & none.


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