trying a 1/3 lower co-witness setup

[rws53]

trying a 1/3 lower co-witness sight setup to see how it works for me on my AR15 carbine...link for more info on 1/3 lower vs absolute co-witness

bottom arrow indicates looking through iron sights
top arrow looking through red dot



tough to get a perfectly lined up camera shot but this is how it appears when looking through irons and then the red dot

 

[Still alive]

I have the same set up on one of my ARs with the fixed front sights but I use an absolute co-witnessed.

What is the advantage vs. disadvantage of a 1/3 co-witness when the field of view still goes through the optic glass?
I always assumed the 1/3 would look through the riser.
Thanks!

 

[juancarlos]

I have the same set up on one of my ARs with the fixed front sights but I use an absolute co-witnessed.

What is the advantage vs. disadvantage of a 1/3 co-witness when the field of view still goes through the optic glass?
I always assumed the 1/3 would look through the riser.
Thanks!

Lower 1/3 just gives you less obstructed view when you have a fixed front sight but it is not as natural to co-witness. If you are only using the iron sights as a backup if your optic fails it doesn't really matter as you can still align the sights through the optic. But if you like the dot to line up with the front sight every time you shoot than absolute co-witness is easier to use. Of course, all this info is in the link the OP provided.

Personally, I prefer the lower 1/3 if I have a fixed front sight and absolute if I don't as it sits a little lower.

 

[Still alive]

Just noticed the link! Good info! Thanks JC.

 

[Greenhorse six]

Another benefit of running a lower 1/3 , is you can run the stock shorter with out issue and your head isn't cranked forward , more straighter , up .

 

[b_w.]

I like lower 1/3 better. Found the front sight distracting with a red dot when absolute co witnessed. No issue with magnifyed optics though.

 

[Wester]

Absolute co-witness also invokes a parallax conundrum, in other words, always trying to get that dot to sit right on the front sight post. Perfect cheek weld is the consequence and in CQB drills, that doesn't always happen which means your first shot time is longer. Lower 1/3 as mentioned is less cluttered, doesn't have any parallax issues and first shot time from acquired is faster.