Di optic system is easier to gauge target! - Troy Dioptic Apeture DOA Top Mounted Deployable Rear Sight

I am able to squire target sight much easier now, i have this paired with the Troy HK style front sight, and I am able to line up the white lines and aquire target at a much faster rate, it is very clear to see, I haven't done any night practice, so I cant say for sure if it's visible. The apetaure is easy to change from small to big, yet it stays in place, the MOA lines are vey accurate and precise, it does take force to move it if you're not using the tool that was designed for this, I have purchased one and it does make it a lot easier. I started at 25 feet just to get a feel, I did move further and further out 200 yards and I was able to get 1" groups .