Training your eyes for something other than crosshairs?
I started out with iron sights on a 22LR rifle and then shot out of an optic with crosshairs of varying sizes for decades. I always thought the TA01 was a cool optic because it had the range calibration reticles which makes this a fast medium range combat optic. Even though these guns loose a lot of energy by the time they get out to 600yds, they still are deadly, and hits are better than misses. Red dots were the next thing although I was never really a huge fan of them. I was a better shooter than the red dot would allow me to be, but then I finally discovered the Eotech gun sights. The gun sights on these make fast engagements.
Later I got to hold a few of the TA31 optics, primarily the green reticle chevron versions, and they looked really odd to me. I later asked a Rep from Trijicon if he could explain to me how the Trijicon TA31F-G for sale are used. Primarily the top of the Chevron is for 100yds, the Chevron has a hollow center for body shots out to 200yds and the first pole point is 300 yards. After that it’s pretty self explanitory on how to use this optic at medium ranges. The real issue with shooting these optics is knowing how they are sighted in and knowing that you are going to get good use out of it. Most gun ranges I know of are less than 100yds and most guys that own ACOGS never even shoot past that.