Absolute or lower 1/3 cowitness mount list?

[markm]

If youre goin with Aimpoint, get the LaRue STANDARD mount. Its bottom 1/3. There is no benefit to absolute co-witness.

I somewhat agree. I mean... if you have to snap the gun up to your cheek for a full cheek weld...might as well use the superior iron sighting system.

Lower 1/3 isn't perfect either though.. you have this honkin' electronic sitting even taller on your gun which is a little bulkier and clutters up your down range vision... plus shooting irons with a lower 1/3 optic just flat sucks... I screws up your sight picture.

[R Moran]

FWIW,
A friend has an MI, and told me its an absolute co-witness.

I've tried/used the the Warne Aimpoint specific ultra high ring, it is absolute co-witness.
I've tried/used the "Gun-tech" Brownells brand, absolute-co-witness also. I would almost swear it was offset to the right also.

Bob

[Schadenfreude]

That's not really true.

1. Inside of 50 yards, it DOES make a difference where the dot is in the tube. You do get "some" parallax. Outside of 50 yards, you are "parallax free". (You can try this for yourself at home. Put the sight in a vice, put the dot on something in your living room and change your head position. It won't stay on the same point at close range.)

2. You don't have to have absolute to check zero. All you need to do is aim at your target with your (something more than 50 yards away) with your sights and your dot should be right on top of your front sight, assuming you use a 6:00 hold.

3. You should ALWAYS shoot with both eyes open with a RDS. Otherwise you are going to be sighting down a very narrow tube and occluding your other eyes view of the target and greatly restricting your situational awareness..

4. It won't hit in exactly the same point with the cover up. It can't. Your non-domninant eye is over some difference laterally (unless you are very deformed) and it will be offset towards the eye that isn't looking through the occluded sight.

5. You're right about the astigmatism though.

1. Ok there is some parallax at close range imo practically zero. All my rd's stay within 1" at roughly 3 yrds no matter where they are in the optic, in a cqb situation .5" at 3yrds shouldnt matter unless your doing something that you probably don't have time to do anyway.

2. I have what I call absolute zero & my dot is split by the top of the front sight at range when looking through the sights. I zero my sights to split the center of a bullseye. I zero my dot to sit on the center of a bullseye thats my personal preference. You are correct 1/3 or absolute should look the same at range as far this relationship of irons to dot goes.

3. I do shoot with both eyes open I was just trying to show a point about the front sight.

4. Ive never had trouble ringing 6" steel at 200 yrds with the cover closed (as an experiment) so if it is of it isn't by much.

[Schadenfreude]

"There is no benefit to absolute co-witness."

If there is no benefit what is the downside?

[kmrtnsn]

A cluttered sight picture.


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I am here: http://maps.google.com/maps?ll=34.276165,-118.378733

[Schadenfreude]

That is why use front & rear flip up sights - hence no clutter, also no need to find 2 seperate cheek welds.

[Schadenfreude]

To the OP some mounts are mentioned by name in this thread

https://www.m4carbine.net/showthread.php?t=17049

[Failure2Stop]

That is why use front & rear flip up sights - hence no clutter, also no need to find 2 seperate cheek welds.

Hence no irons for immediate use when the RDS goes down.

Really though, this has been chased around the tree many times.
There are very few shooters with what I consider significant experience on both arraingements that opt to employ absolute cowitness.
Neither side seems to give up their (usually random by virtue of purchase) preference with anything but time on gun and with side by side testing.

Really though, this thread was started to ask about mount heights, so further dialogue should at least contain a reference to a mount and whether it is absolute or lower 1/3 cowitness and/or your experience with that mount.

Thanks.