Apex RPG-7 does not allow zeroing change, even though the 3d model represents a sight with such capability. It also doesn't show what distance it's zeroed at (and is possibly the only gun ingame that does it). One could think it's zeroed at 350 meters, a distance that model's sights is zeroed at, but no, it's zeroed at 200.
So this ticked should be two tickets: bug report (no distance shown) and feature request (distance change), but I somehow don't believe the feature would get there (yay for optimism).