Firearm Optics Comparison?

Are the differences between red dot > holographic > ACOG > rifle scope just a straight upgrade? It seems like with a rifle scope you get a sight dispersion of 0 but you miss out on the slight aiming speed bonus of 6/6/2 respectively which seems trivial in comparison. This does not seem intuitive. I understand how a rifle scope would zero out sight dispersion, but red dot sights make target acquisition significantly faster. Is there some hidden stat I am not aware of? Because the optimal play seems to put rifle scopes on everything. Additionally, what is the point of offset iron sights? Under what circumstances would they be used?

Weight and volume are also considerations, as they will slow down your aim as well. Rifle scopes are very accurate at long distances, but a hindrance when something’s up close rushing at you.

Is this reflected in the item stats? I did not see anything change re: aiming speed between for example a regular stock and a folding stock.

It varies depending on the gun mod. The system’s a little weird and unintuitive, IMO. In that particular case, you’re probably seeing one of the other limiting factors for aim speed besides weight.