An inquiry about the word ACSS has been addressed to Hunt Net. This feature has nothing to do with the standard use of an 8-power rifle scope. It's all about the reticle design, as well as using elevation and windage markers within the sight itself while avoiding turret knobs.
The "sub-tension" arrangement is what we call this part of the scope, and it's found on most long-distance, military, and sniper scopes.