Quote Originally Posted by GRA556 View Post
Yes but they are supposed to be accurately calibrated out to 500 yards. I'm just wondering if this system actually works. I've never been to a range that went beyond 100 yards so there is no way I can really check it out for myself.
Just like the A1s, when the sights are zero'd as they should be, the A2 sights are accurate to at least 500 yards. The trick to being accurate out past 100 yards is knowing what the proper sight picture should be at a given distance. You still have to account for bullet drop. I had to learn this in boot camp almost 40 years ago.

Here is a page from my boot camp notes on the M16A1 depicting the different sight pictures based on a 100M zero using M193 ammo.



Notice that the 300M target shows center-mass, the 200M target shows 6 o'clock, and the 500M target shoes head & shoulders. Results may be similar for the M16A2. I have not seen anything showing various sight pictures on the M16A2 using M193 ammo.