Up to +5-20% Strength based on the charge time of your heavy attacks. Stacks 3 times.
+5-8% toughness on Chained Hit.
+5-8% Strength for every 10% of magazine spent during continuous fire. Stacks 5 times.
+7-10% Strength for every 4 Single Target Hits. Lasts 2s and Stacks 5 times.