[2021] M113 ADATS

All vehicles in game are modelled with their historical vertical targeting ranges. It is always based on the real life example grounded in proper source material.

If you believe its incorrect, its not down to justifications and reasonings. All that's needed to show its wrong is a source showing the current values are wrong. You can submit a historical report here: https://forum.warthunder.com/index.php?/forum/1952-ground-vehicles/