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Discussion Starter · #1 ·
Hi-

I just got a new 556 Holo model and like to use an EOTECH XPS and get a TROY rear BUIS for it..my questions: would both fit okay for the 556?

-What mount would I need for the XPS to co-witness with the TROY BUIS??

Thanks for your input
 

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Troy WILL co-witness with your Eotech but you nee a new front site as well. Either a sampson that mounts to the gas block or Troy that mounts to rails.

I have Troy rail and Troy BUIS w/Eotech, work perfectly!

Geardo
 

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Discussion Starter · #3 ·
SGT_geardo said:
Troy WILL co-witness with your Eotech but you nee a new front site as well. Either a sampson that mounts to the gas block or Troy that mounts to rails.

I have Troy rail and Troy BUIS w/Eotech, work perfectly!

Geardo

As always, thanks SGT! Question, my new XPS-0 Eotech does not have "quick detach" mount like some Eotech come with the accucams..are there any brands and styles out there you'd recommend??
 

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You are welcome!

As for quick release mounts...

I haven't had the chance to use any. There might be a quick release that replaces the screw but other than that I think they have to come with the levers. I just did a quick search on Google to see if there was anything, and I found nothing yet. But I will let you know if I do.
 

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...i would just mount your Eotech directly onto the rail...and shoot with your BUIS folded down...as you should be doing...with both eyes open...and not be co-witnessing...when up...your AR height sights will appear roughly in the center of the Eotech's window...

...if you "absolutely" feel you need a QD mount...this will work...

... http://stores.homestead.com/Laruetactic ... .bok?no=33
 

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ullie...

Why not co-witness? I did with my M4 and it worked just fine.
 

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Discussion Starter · #7 ·
ullie said:
...i would just mount your Eotech directly onto the rail...and shoot with your BUIS folded down...as you should be doing...with both eyes open...and not be co-witnessing...when up...your AR height sights will appear roughly in the center of the Eotech's window...

...if you "absolutely" feel you need a QD mount...this will work...

... http://stores.homestead.com/Laruetactic ... .bok?no=33

Thanks guys- FYI I found that GG&G has a accucam for my XPS-2 model, and unlike the LaRue it does not raise the height of the sight..


http://www.gggaz.com/index.php?id=289&parents=69,71

I'm also curious, why not- "co-witness"?? I've read many tactical articles and they suggest CO-Witnessing with the BUIS up at all times in case the Eotech/Aimpoints fail,etc....
 

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SGT_geardo said:
Why not co-witness? I did with my M4 and it worked just fine.
...reflex and holographic sights allow you to shoulder your weapon...rapidly acquire your target and fire...eye position...head position and a consistant cheek weld are not critical...you are focusing upon the target with both eyes...and looking through and past the optic...specifically the aiming tool...ie the reticle or dot...and not focusing on it...not even a little...it just happens to be there in front of your eye...as long as you can see the dot or reticle...you are good to go...

...when using iron sights...your eye and head position...along with a consistant cheek weld are critical...your pupil needs to be directly behind the irons..ie rear sight...aligning your front sight upon the target...this slows you down considerably...

...when you co-witness...you are using your irons and kinda forcing the "aiming tool of the optic" to be along the same line of sight as when using your irons alone...making your eye position ...head position...and cheek weld critical...you're basically using your irons while the dot will appear in your line of sight...assuming both are zeroed for the same range...not the proper way to use these optics...

...the optic is your primary...the irons are your back up sights "only"...and should be folded down so that you aren't distracted by the "optical clutter" they present in the optical window...for example...optical clutter may induce aiming error and also your confidence in a dynamic situation...thereby slowing down your ability to deliver deliberate aimed fire...
 

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hk91308 said:
I'm also curious, why not- "co-witness"?? I've read many tactical articles and they suggest CO-Witnessing with the BUIS up at all times in case the Eotech/Aimpoints fail,etc....
...co-witnessing slows you down...a lot !...something that you cannot afford in a dynamic engagement...

...the probability of your Aimpoint failing is far far less than having a malfunction...or even a breakage of a critical part on your weapon...these types of "field grade" optics just don't fail if properly tended...although anything can happen...and sometimes does...

...the disadvantages of having your BUIS up...especially the rear sight...far outweigh any benifits IMO...
 

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ullie...

I guess it comes down to shooter preference. I can see what your saying but then I think about zeroing the optic without BUIS to set it up, how(besides bore sighting)? I personally use the front sight and eotech as rear sight, after co-witness. I can hit targets out to 500m. I have done it with both reflex (Aimpoint) and holographic (Eotech) mounted on M16A2 and M4 many times. I haven't yet had a chance to zero any of my sights for my 556 yet. Just "blasting" at about 50-75 yards.

I think if you want to use your reflex or holographic sight for anything beyond 50m you should co-witness it with your BUIS, then drop your rear BIUS. But if you are just goin to use it for CQB go up a couple of clicks after co-witnessing?

Try co-witnessing your optic with your BUIS after zeroing them, drop the rear sight and you might be surpised! you can also drop your font BUIS and still be accurate for CQB.

Geardo
 

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Discussion Starter · #13 ·
SGT_geardo said:
ullie...

I guess it comes down to shooter preference. I can see what your saying but then I think about zeroing the optic without BUIS to set it up, how(besides bore sighting)? I personally use the front sight and eotech as rear sight, after co-witness. I can hit targets out to 500m. I have done it with both reflex (Aimpoint) and holographic (Eotech) mounted on M16A2 and M4 many times. I haven't yet had a chance to zero any of my sights for my 556 yet. Just "blasting" at about 50-75 yards.

I think if you want to use your reflex or holographic sight for anything beyond 50m you should co-witness it with your BUIS, then drop your rear BIUS. But if you are just goin to use it for CQB go up a couple of clicks after co-witnessing?

Try co-witnessing your optic with your BUIS after zeroing them, drop the rear sight and you might be surpised! you can also drop your font BUIS and still be accurate for CQB.

Geardo

Thanks SGT!
 

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You are welcome!
 

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SGT_geardo said:
I guess it comes down to shooter preference. I can see what your saying but then I think about zeroing the optic without BUIS to set it up, how(besides bore sighting)?
...why would you need your BUIS to zero an Aimpoint or Eotech?...in fact...you should zero your irons and optic independantly of each other...

...on a weapon chambered in 5.56 with a carbine length barrel...using NATO STANAG ammunition...or anything close...first...you mechanically zero the optic...mount it correctly...place the aiming tool over the target and fire at your target @25 yards...adjust as necessary so your POI is ~ 1.2 inches below your POA...this gives you a rough 50 yard zero with a distant zero of ~200 meters...confirm @ 50 yards...and 200 "meters"...ie ~220 yards...adjust as necessary for a 200 meter zero with the ammunition that you will be using...and you're GTG to 300 yards with a slight holdover...otherwise...aim dead on...these are "combat sights"...not precision optics...designed to enable you to rapidly place hits on man sized targets well past any reasonable engagement range you're likely to encounter...

SGT_geardo said:
I personally use the front sight and eotech as rear sight, after co-witness. I can hit targets out to 500m. I have done it with both reflex (Aimpoint) and holographic (Eotech) mounted on M16A2 and M4 many times. I haven't yet had a chance to zero any of my sights for my 556 yet. Just "blasting" at about 50-75 yards.

I think if you want to use your reflex or holographic sight for anything beyond 50m you should co-witness it with your BUIS, then drop your rear BIUS. But if you are just goin to use it for CQB go up a couple of clicks after co-witnessing?

Try co-witnessing your optic with your BUIS after zeroing them, drop the rear sight and you might be surpised! you can also drop your font BUIS and still be accurate for CQB.

Geardo
...sorry Geardo...

...optic...primary...BUIS...backup only...you shouldn't mix the two !
 

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I feel pretty dumb right now... :cry:
 

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SGT_geardo said:
Why not co-witness? I did with my
ullie said:
...the optic is your primary...the irons are your back up sights "only"...and should be folded down so that you aren't distracted by the "optical clutter" they present in the optical window...for example...optical clutter may induce aiming error and also your confidence in a dynamic situation...thereby slowing down your ability to deliver deliberate aimed fire...
Have you noticed most military with optics have front site that is permanently up?

If you have hooded front but don't co-witness, should you put scope above front?
 
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