Veteran
12-24% Rending on Enemy Weak Spot Hit for 3.5s. Stacks 5 times.
52.5-60% Weak Spot Damage (Enemies with Bleed Stacks).
Point blank shots cause an explosion. Explosion Radius increases by 10-25%.
Ranged hits add 1-4 stacks of bleed to enemies.
The funny "grenade spam Veteran build" with bleed on everything.
Lethal Proximity on Bistol with Grenade Tinkerer gives your grenades +50% range, applying bleed to probably everything you can see. Two stacked bleed procs from grenades (Twinned Blast proc or throw 2) can completely kill many enemy types (e.g., Gunners and Ragers). Uncanny Strike does not just apply to knife but all your attacks while it is stacked up and also causes your bleed procs to do relevant damage against armored targets like Crushers and Maulers.
Alternative: Drop Serrated Blade and get Grenadier and then exchange Mercy Killer for Flesh Tearer .