3.5-5% Critical Chance on Weak Spot Hit until your next Critical Hit. Stacks 5 times.
7-10% Reload Speed for 3 seconds after Close Kill. Stacks 5 times.
Kill every ranged and special in every room you enter and every packed hallway. Gun down the weaker targets first to stack up Marksman's Focus, then the rending will help burn the tougher ones. Regenerating Krak Grenades means you can use them somewhat freely on Carapace armored enemies and Ogryn. The endless stream of lasers means that weakspot hits on Monstrosities are pretty regular as well. When ADS, you have +35% crit rating, which is effectively 35% more ammo in the gun, so spray away.