cowitness and lower 1/3 co witness

[mutt]

All absolute and lower 1/3rd really means is the height of your optic mount. Some people, especially those with a fixed front sights, like a less cluttered FOV so they opt for a higher optic mount. This places the front sight post in the lower 1/3rd of the optic's tube. Some people like the center of their optic tube to be exactly where their irons are. Those are absolute cowitness and the front sight post will appear in the center of the tube. For those with flip down fronts (like you) it's just a matter of preference on how high you want your optic. Example (the left is absolute cowitness):




If you were to look through your irons on the lower 1/3rd, your dot would appear inside your rear aperture and be superimposed over the tip of your front sight post (assuming they were zeroed at the same distance as your RDS).

[kidicarus13]

[brutal]

Well, some of you caught me mid-edit.

Because the red dot is holographic, any time you can see the (zeroed) dot on POA, it's on. That doesn't mean it's going to be lolipop on the FSP.

BlasterBob was right to begin with and I corrected my post after I reread what I typed. As long as you look through the rear irons and lolipop the red dot, it doesn't mean crapola if it's absolute or 1/3 lower co-witness, if you see it on the FSP, it's good for a rough zero.

This image probably does the best job showing all the options. Basically what you will see depends on whether you are looking through the rear sight or not...



See, that's what happens when other post on you mid-edit. hahah.

[mutt]

Well, some of you caught me mid-edit.

OK. Universe makes sense again

[Hackman]

Please see photograph again. Does it look like the sights are aligned with the center of the optic? Did my lgs sell me some weird extra tall sights? Are the optic manufacturers jacking with me??

[Hackman]

I just realized how ridiculous that gas block looks. It wasn't cheap either.

[mutt]

Flip up your sights and turn off your RDS. Look through your irons. If they fall below the centerline of the tube, the mount is lower 1/3rd. If they are in the middle, mount height is absolute.

[Hoser]

Two things.

1. Take off those silly back up sights.

2. Get your scope sighted in and leave things alone. Go to the range and shoot.

[Great-Kazoo]

Two things.

1. Take off those silly back up sights.

2. Get your scope sighted in and leave things alone. Go to the range and shoot.

Once he has the dot aligned with his iron sights. Based on his other thread, he will end up starting all over not having a clue why the rounds are not hitting the target.

What the OP really needs is to
#1 stop over thinking this

#2 get someone to go out (besides ML) who already assisted. Bringing their rifle with RD & buis so he can see how one that's on paper / sighted in is

#3 FORGET how it looks cosmetically OP. Which IMO is what you're doing. You're thinking physically how 1/3 co-witness looks instead of how it works mechanically.

#4 ask the mods to close one or the other of your threads . it will eliminate some of the obvious confusion you're having.

[SideShow Bob]

I am so frustrated. How could this be lower 1/3 co witness with the sights and red dot right in the very center?

It's not, you must have the shorter mount, so you have absolute co-witness. Lower 1/3 would be a taller mount to where your iron sights line up in the lower 1/3 of the optic.