Target receives 1-4 Stack(s) of 10% Damage if already Staggered. Lasts 5s.
19-25% Impact for 1.5s on Hit. Stacks 5 times.
4.5-6% Close Range damage on Repeated Hit. Stacks 5 times.
5-6.5% Strength for 3.5s on Close Range Kill.
Straight forward Call of Duty build.
Aim down sights and left-click the head. It is tempting to unload onto everything, but it would help you to conserve ammo if you only shoot at stuff that shoots back.
Marksman focus can stay around for a bit if you keep the momentum going and claiming heads. At 10 stacks, you can start to become more effective against armored enemies.
Krak grenades for packs of crushers and bulwarks, shovel to give you space. If you want to sacrifice mobility for more power, use a power sword instead. Your mileage may vary, but I always favor melee weapons that help me maneuver through the chaos on the Veteran.