M16 rear ironsight has odd shadow artifacts, see images. Additionally, I noticed it can be zeroed to 100 meters and 200 meters (and more) separately, although I believe in real life the flip-up ironsight has just 2 modes - close quarters and more distant engagements, so perhaps these ranging settings should be simplified to reflect that (such as 100 meters - 400 meters)
How works rear sight:
The rear sight has two apertures for range. One aperture is marked 0-2 for short range from 0-200 meters and an unmarked aperture for normal range from 300 to 800 meters.
So then it should only be possible to range it for 0-200 and 3-800 meters, right? Currently, it's rangeable in increments of 100 meters, which shouldn't be possible.
According to zeroing manual it should be 300-800m zeroing, 100m increments, there is a mark on left side of sight.
"8/3" means 800m and 300m. When the elevation knob is very close or flush with the bottom (full counter-clockwise) , the elevation is set for 300 meters or closer. If you rotate the elevation knob one full revolution (360 degrees) clockwise and the "8/3" mark shows again the elevation is set for 800m.
Currently there is no zeroing animation (sight lift up/down) for M16, only aperture flip.