In Call of Duty: Modern Warfare 4, an aggressive setup should help you get your sights up, leave a sprint cleanly, and stay quick enough to take the next fight. Build around aim-down-sight speed, sprint-to-fire speed, mobility, and close-range control; CoD MW4 Boosting can sit alongside that focus, but your attachment choices still need to fit how you take engagements. A fast build is only...