I am just curious if irons sights always sit this low in an Eotech. at the “2” on my KAC 600m rear BUIS the bottom portion of my Eotech cuts the little circle in half. And it almost become level with the front sight. I tried to take a photo but I can not get my phone at the same angle as my eyes.If this is normal let me know. I tried to find a photo on google where somebody had the same set-up but my google fu failed. All the photos I looked at sit higher then mine do.
How did you go about zeroing the irons? i can barely see the front site. I have always had an absolute co-witness optic or a magnified optic so it’s new to me. Do I need to take off my Eotech and zero it, then put it back on and zero the Eotech? maybe i’ll stop playing with it and go shoot it tomorrow.
Why do so many people worry so much about co-witness anyway? Please correct me if I am wrong… The dot sight is your primary sight and the BUIS is just that… A backup sight. How many ways can the primary sight fail?? If the dot goes out due to a dead battery you have nothing to co-witness with. If a blob of mud ends up on your lens what good is a properly co-witnessed sight? If you are shooting a dot sight correctly, with both eyes open you don’t see the front sight unless you are looking for it instead of looking at the target. Someone please explain it to me.
I zero the irons separately with the RDS unattached. When I put the RDS on, I get a rough zero by matching the dot to the iron sight picture, but then finalize it separately. Even the EOTech is not 100% parallax free, and you will have POI shift between the RDS normal sight picture and using the cowitness.
I assume that’s an EXPS series EOTech? If so, it has a 7mm riser built in so it has a lower third co-witness. So what you see is normal. If you’re after a more “centered” co-witness, you’d need the XPS EOTech.
You’re not really meant to use the irons in conjunction with an EOtech. It will be, at a minimum, a lower 1/3 cowitness. Sometimes it will be a lower 1/4. You are only supposed to drop down to use the irons if you really need them.
I understand this. my main question was how i was suppose to co-witness it (for my rough zero before final zero) if i cant even see my front iron sight. but you guys answered everything.
If you want to use your iron sights you shouldn’t be forced to look through your primary sight to use them. If your primary sight is operational why do need a co-witnessed backup sight? Please tell us why the ability to co-witness an iron sight with an electronic sight is important to you? I don’t think you understand how a red dot sight is meant to be used. Try this little experiment. Turn your eotech on and put a piece of black tape over the front of the lens. Mount the rifle and pick a target with both eyes open. The fact that you cannot see anything through the optic does not impair your ability to engage the target! This is why Aimpoint uses the clear rear cap. It is not necessary to see through the optic for the concept to work. If you do NOT have to see your front backup sight why do you care if it is co-witnessed of not? If your eotech is down and you flip up your rear sight to engage a target why do you care where the dot would have been if it were working? What am I missing?
I have a red dot on my issued rifle… I’m pretty sure i know exactly how it is meant to be used. I just want to be able to see my iron sights because i still shoot with them to retain that skill…I’m not so much worried about the Eotech lining up with them. I turn it off and shoot irons. but i cannot see my front sight through the Eotech body…
I’m not up on the 500 series EOTechs (just noticed you stated you have a 556). I think those have NV. You may want to sell it & look into getting an XPS3 model that has absolute co-witness with NV.
You don’t need to see the entire FSB to use the irons. You only need to see the tip and you can do that, even feom the pic you have above. Use the large appiture and you will see more of the protecrive wings and the bottom of the post.
If you have properly zeroed your irons & the dot - when you line up the irons you will have a co-witness. I prefer an absolute with flip up sights. I want to look through the sights & see that dot sitting atop the front post to verify that both are still zeroed, then I flip those damn things down for a clean unobstructed view & just use the dot. If the dot craps out flip them back up & have at it.
I don’t quite understand the interrogation you got for wanting to be able to flip up your irons and use them through your Eotech to maintain skill or in the event of the Eotech going down. I could see the rear aperture being cut off hindering this quite a bit.
I will say, I just got an EXPS2, which I think is pretty much the same height since it is also designed for a lower third cowitness and it does a nice job with my Magpul MBUS Pros. It doesn’t cut into the circle at all. I wonder if the KAC sight is sitting a little lower due to its rear adjustment. If you have access, maybe you could try a different set of back up sights and see how they line up.
