The IRNV has come in handy so many times. First, it makes it easier to hit things as you can see them better. Second, as a medic in the middle of a squad you can back up your teammates with anti INF action. In long range fights I'm hiding from snipers and reviving my team mates killed by them.
I use the 2-shot burst SABR with a foreward grip (saving for the advanced which helps to tighten the spread), compensator, high velocity ammo and the 4x Triple chevron scope. For my playstyle (I work with the "fire team" and less with the "assault team") the triple chevron is Optimal. The chevrons help me to calculate bullet drop and the effect of recoil at various ranges that are essential to long ranged assault rifle play
