the only way you can fully disable the engine is by shooting both sides you basically cant make the engine red from shooting it from one side, which most people will. Most people cant see both sides of the taru at the same time.
I just want to hear your guys opinions, which is harder CQC or Long range. Long range is hard obviously because of the max zoom for scope being so low, but Cqc can be hard because of reaction time and lag.