+52.5-60% Weak Spot Damage (Enemies with Bleed Stacks).
+12-24% Rending on Enemy Weak Spot Hit for 3.5s. Stacks 5 times.
+30-60% Rending on Critical Hit.
+10% Critical Chance for every 0.3-0.45 second while aiming. Stacks 10 times. Discharges all stacks upon firing.
You could swap out the Melee Damage Boost + Sustained Assault Nodes if you want to get Duellist + Second Wind. Both are variations are good/auric tested.