How important is Eotech/ iron sight co-witness?

[Escalado]

At the moment I have an Eotech sight on my flattop AR. I just purchsed a Vltor CASV fore-end and unbenounced to me learned that the Eotech will not co-witness with the iron sights becasue the CASV will raise the Eotech .5" . My question is how important is the co-witness in regards to accuracy? From what I have read the advantage of it is in the case of a sight failure and an easy way to zero the sight? Are there any other advantages because I want to use both..My plan is to use the Eotech and also run clip up sights...Thanks

[Jicko]

Co-witness is just a preference thing. If you are not setup for co-witness, you can always remove your EOtech when it fail and use your iron-sights(BUIS, if you have them installed, and zeroed prior to installation of your EOTech)

It is a GOOD idea to at least have BUIS installed, so that you can still use your rifle when your optics fail. But if this rifle is not your work rifle, and it is just your fun rifle, then, even skipping BUIS is ok (really depending on how much you think you will ever need to DEPEND your life on this rifle....).

Afteall, your rifle is NOT a battle-rifle, it is a recreational rifle.

[xYourLocalAR15x]

I never use co-witness. It just makes everything confusing. Why would you even need the rear sight to aim with the eotech? when your head isnt perfectly center with the eotech, the red sight is cocked to the side of the screen. The BUIS will just get in the way.

I adjusted my eotech to shoot out to 200 yards. A lot of people said you can only shoot up to 75 yards with it.... Seems like they were wrong?

I was shooting at the 2nd berm at angeles shooting range. maybe thats 150 yards?

[Jicko]

I zero my EOTech for 300 meters w/ official US Army EoTech M4 "Zero Target".

http://www.eotech-inc.com/documents/M16A4-M4MWS_EOTech_LBS_Target.pdf

http://www.eotech-inc.com/documents/M16A4-M4MWS_EOTech_Live_Fire_Target.pdf

A lot of people said you can only shoot up to 75 yards with it.... Seems like they were wrong?

Are they mounting their EOTechs on their AIRSOFTs?(then they are not wrong!)

I have no problem hitting man-sized targets out at 200 or 300 meters consistantly.

[PIRATE14]

As mentioned CO-WITNESS or not too........

It's personal preference......and what style of shooting you like to do.

Aimpoint, EOTECH.....almost any dot sight is good out to about 300 yds......you can use it out farther but you have to practice your hold over.

Hold over......how high you put the sight above the intended target to compensate for bullet drop/flight path/wind.....etc.

[JWC6]

Some people actually prefer that the eotech sits a little higher, so the front sight post appears lower when viewing throught the eotech.

Larue tactical actually makes a dedicated mount that does this.

Personally, my eotech does co-witness with my FS and my ARMS 40L, but I think I would prefer the eo to be a little higher....

[GTKrockeTT]

why should one co-witness...cause it's so tacticool to do so.

[magmaster]

Aimpoint/EOtech is for quick target aqcuisition(sp) so that is why you hear 75 yards. I have shot with my Aimpoint to 200 yards with no problem. On a paper target it will cover the whole target but on a man sized target it will do just fine.

Personally I keep my BUIS flipped down when using the red dot. But I can flip it up to co witness if needed should the site fail. I don't think the red dot is designed to be used at more than 1-200 yards but that is my thought. I have an ACOG for anything over 200.

[Gunfighter01]

I use the RRA dominator. Its an Eotech mount with built in rear iron sights. Its made specifically for the Eotech and co-witnesses perfect with the front sight post, absolutely no modifications, just mount, sight in and shoot.

[gatdammit]

At the moment I have an Eotech sight on my flattop AR. I just purchsed a Vltor CASV fore-end and unbenounced to me learned that the Eotech will not co-witness with the iron sights becasue the CASV will raise the Eotech .5" . My question is how important is the co-witness in regards to accuracy? From what I have read the advantage of it is in the case of a sight failure and an easy way to zero the sight? Are there any other advantages because I want to use both..My plan is to use the Eotech and also run clip up sights...Thanks

Have the same problem... and this maybe a solution...

http://www.bravocompanyusa.com/YHM-226-Mini-1-2-Riser-Picatinny-Rail-p/yhm%20mini%20riser%20yhm226.htm

http://www.uws.com/PICATINNY/RailsandMounts.html

haha.. this thread is over two years old? damn I guess I should read up on this stuff before buying a CAS-V

[WallyGeorge]

why should one co-witness...cause it's so tacticool to do so.

To me, its vital to co-witness as you have a ready means to verify your scopes zero.

Twice I've discovered my duty weapon sight was way off (one was armorers fault, other was loose mount). Never would of caught errors unless had BUIS co-witness to reference.

Plus, its so tacticool...

[technique]

It's important, Optics fail. You may not have time to remove your optic and use your Irons, before being bitten by a Zombie. Super important!

[joelogic]

I setup my BUIS in order for me to practice a good cheek weld. Some people dont realize that red dots have some parallax so a good weld fixes that.

[X-NewYawker]

NO TIME TO CHANGE BATTERIES!








BTW, one of the reasons you don't see me at the range this time of year is I make about one hundred different Halloween masks a year, like the one above from your Halloween Spirit Stores.

[aplinker]

man... a lot of people really don't understand how co-witness works.... maybe it's better now, but it was pretty clear some of those people early in this thread didn't get it.

Maybe someday I'll make a little movie or series of pics to explain... I think the part that people miss is the concept that the dot moves as your cheekweld/eyeline moves.