I’ve come in some extra cash and was really looking into the Aimpoint T-1 setup on my DDM4 v1 with the DD iron sights. What I’m wanting to know is if I get the DD mount for it; will I look through my back sights then through the Aimpoint and the FSB will be in the way? Or does it set higher than the irons?
The DD mount will give you a line of sight on your irons that sits in the lower 1/3 of the Aimpoint Micro’s glass. It’s not an absolute co-witness, and the front irons won’t be in the way.
The DD mount provides a lower 1/3 co witness, so your irons will be visible in the lower third of the T-1. This is the preferred setup of many people.
Although this is the Larue mount, this picture shows what the 1/3 co witness looks like (on the right):
Thanks for posting the pic. I’m new to this type of set up. I usually just ran a scope. Is this what basically alot of people look for in a setup that I’m wanting to use?
Thank you. Would you mind explaining “co-witness” please?
The stickies are your friends: https://www.m4carbine.net/showthread.php?t=17049
There would have to be a poll, but I do believe that most people use the lower 1/3 co-witness with their RDS.
With fixed front and rear sights, a lower 1/3 co-witness keeps the irons out of the way when using the aimpoint.
Co-witnessing your sights means that your irons and red dot are aligned and aimed at the same thing, at the same time, or something like that.
An absolute co-witness means that you will have the same line of sight from rear iron sight, to red dot, to front iron sight, to point of aim on the target.
A lower 1/3 co-witness means that you’ll have a separate line of sight with your rear iron, front iron and point of aim on the target that is in the lower 1/3 field of view through your optic than you’ll have for the line of sight with your red dot to point of aim on the target.
In either setup, it is important to separately verify and confirm that your irons are sighted in, and your red dot is sighted in, not that they just “look right”. Since they are two separate sighting systems it is important to be able to use them separately if the situation calls for it.
Some people prefer the absolute co-witness so that 1) everything lines up and 2) they don’t have to get a new cheek weld to use their irons. And some people prefer the lower 1/3 method so that 1) they have a more open field of view through their optic and 2) they can have a more “heads up” cheekweld on their rifle.
Think about what you’d like to do and then buy/train accordingly.