Eotech 512 grouping

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AdamJaw89

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Today i went to the range too sight in my new Etoech 512 on my Stag Arms M-4 AR-15, i have never sighted in an Eotech before and just wanted to show you guys the groupings that i shot to see if they are good or if the Eotech needs to be fine tuned more. I sighted the Eotech in at 50 yards. If any of you have an info or tips on how to make the groupings tighter or better please let me know it will be much appreciated. the pic is sideways, i couldnt rotate it....sorry. and yes i was shooting the rifle off a bench with bags. oh and i am pretty sure its not the etoech...... it's me like i said this was my first time trying to zero an eotech so i am not a pro at it.
 

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I would fine tune it. Are you shooting off a bench with bags? Is the rifle more accurate than that?

Welcome to THR.
 
work

I agree, it needs work. But it is a combat sight and not a target sight. Sill it should do a lot better.
 
how where you shooting? was the gun on a bench, bipod, sandbag etc? where you standing, prone, kneeling? what kind of rifle where you using?
 
That is a lot of vertical stringing... it is possible you need to work on your breathing.

the op said the pic was sideways, i thought the same thing at first.
 
If any of you have an info or tips on how to make the groupings tighter or better please let me know it will be much appreciated

A $30 3x9 Tasco from Walmart will be better for shooting small groups than your eotech, thats just not what they are designed for.
 
With a cheap NCStar 1.25x scope on my RRA AR15 at the same range, shooting prone and pretty quickly, my grouping is approximately 1/3 as wide and close to half a high as what you show.

I guess that answers my question about whether or not I need an Eotech.


-Matt
 
I don't think it's the EOTECH, unless it's somehow misadjusted or broken. I'm a fat, old guy with bad eyes, and my RRA with an EOTECH 512 shoots tighter groups than that. Now, having said that, I have to agree with some other posters - you aren't going to get "pin point" accuracy with an EOTECH no matter what you do. Find a nice 3x9 scope for more precise shooting.
 
A big problem with dot sights is that they are VERY sensitive to the shooter's cheek weld which changes the shooter's eye's alignment to the optic, the dot's, and gun's orientation on the target which moves the POI sideways,up-down and even circular. A too short or too long stock will agrivate this problem.
I have experienced this several times with 3 different dot optics. Moving from a bench to the standing position will have the same effect. I now use an adjustable stand as a rest about 5' tall so that I can sight my dot scopes in from a standing position which is my most common shooting position.
Dots are for quick shooting situations, Minute Of Milkjug. Though I can get hits out to 100 yards from a rest with my Bushnell M&P I am relying more and more on a 2-7X scope.
 
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at that range, my 512 with BUIS co-witnessed, gun braced, with PMC ammo keeps groups around 1 MOA if I do my part.

So no, that is not inherent inaccuracy with an EOtech; something is amiss elsewhere.
 
A big problem with dot sights is that they are VERY sensitive to the shooter's cheek weld which changes the shooter's eye's alignment to the optic, the dot's, and gun's orientation on the target which moves the POI sideways,up-down and even circular.

No offense, but this is incorrect. Although it is a problem with many other optics, it is not the case with an Eotech. In fact, this aspect is one of the major benefits of the Eotech system.

If you check out the Eotech website there should be some info explaining this. Basically, no matter how off center the reticle appears, your shot will still hit POA. This is a major benefit if for some reason the optic is damaged (ie cracked glass). ETA: Here's the link explaining this concept. http://www.eotech-inc.com/page.php?id=8

So, OP, I wouldn't factor that as a possible problem. As long as you see the reticle, the bullet should impact wherever you put that dot (assuming it is zeroed correctly).

Also, you probably aren't going to get amazing long range groups with an Eotech. I often do better with anything past 50 yds using the irons. I'm not saying that's going to be the case with everybody, but it's the case with me. The Eotech's main purpose is quick target acquisition in CQB. It's just not made for precision. Of course, with a bit of practice, I have faith that you will improve. It took me a few trips out with my 512 before I started getting the accuracy out of it that I wanted.

If you really want to see the benefits of speed that the Eotech offers, head out to the woods, set up a bunch of coke cans in different places and do some "speed plinking." You will see that the Eotech is an amazing tool in terms of fast follow ups and speedy target acquisition.
 
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A common mistake among new Eotech users is to turn the brightness way up,because it's fun.This overwhelms the target and causes poor groups.Turn it down so it is visible but not overly bright,and look at the target,not the reticle.Groups will shrink dramatically.
 
A common mistake among new Eotech users is to turn the brightness way up,because it's fun.This overwhelms the target and causes poor groups.Turn it down so it is visible but not overly bright,and look at the target,not the reticle.Groups will shrink dramatically.

Those are some great points. If it's too bright, it's all fuzzy and makes it hard to focus on the target.

OP, are you keeping both eyes open when you shoot?
 
When I'm lining up a shot, I notice my point of aim moving side to side as I breathe . . .
 
i had the brightness turned down to one of the lowest settings and yes i was shooting with both eyes open, i think i am just going to have to get a laser bore sighter.
 
hey thanks for the welcome! and yes i was shooting on a bench and i was using bags, i think im just going to buy a laser bore sighter to get a better zero.
 
Those laser bore sighters, or boresighters in general, are only good for getting on paper. Fine tuning is done the good ol' fashioned way of sending lead downrange. If you want it extremely accurate you wil need to find some match ammo or handloads.
 
yup your right i just found that out, i wont need a boresight since i am already on paper and am pretty close to zeroing it. ill just have to head back to the range this weekend and send some lead down range and try to get it zeroed. and ill definitely be picking up some better ammo. i know eotech's were not meant to be super precision shooting sights but i know i can get a lot better groupings and a lot better zero then what the picture i posted above shows.
 
From your photo above it's not your zero that is your problem. It's the ability to aim at the same spot. In order to test this you can get a marker and make a mark like ^ and set the edge of the dot on the tip (centered) you will be high but the dot won't hide your aim point this way.
 
Its not the EOTech. Either its not properly sighted in, or its your rifle, or handling, or ammo

I can shoot 1-2" groups all day off a bench w. my EOTech on a Bushmaster M4orgery using factory ball ammo
 
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