7.5-15% Weak Spot Damage. Weakspot Kills also ignore Enemy Hit Mass.
Up to 5-20% Strength based on the charge time of your heavy attacks. Stacks 3 times.
5-8% Strength for every 10% of magazine spent during continuous fire. Stacks 5 times.
Gain 7-10% Close Damage for 3.5 seconds after killing an enemy at close range, stacking 5 times.