3 shots with the .50 to take down the tank doesn't seem right. Small arms honestly shouldn't be able to destroy it at all, the fact that you can eventually take it down with a crossbow makes me lol.
The Tavor looks nice, I'd suggest a Mars sight + Magnifer as that's what the IDF uses typically for long range but, since you asked for Acog, I'd do the 4x32 with an arrow reticule.