Use sword on 107

Tofu, use guns, they can kill boss. Actually they are quite useful because they can cill anyone

if you use bolt launcher it can kill a boss

@Shakon_Krogen I made the guide following my playstyle and what worked. So I would not call it a comprehensive guide but the best strategy that worked for me.

despite you saying that the homing launcher is good for the boss on horizon hq (the Helo) i find i miss a lot of my nades with the homing over the standard variant and i find the standard assault rifle to be stupidly good against it over most of the other weapons

dual wield smgs melts most bosses

I found that camping the 2 doors(they are also enemy spawns) in the corridor next to the final turret activation in oil rig rage mode was p effective, even though there are those red glowy guys showing up to *interfere the turrets, the boss will drop hp regardless, so theoretically you can just sit in that corner of the map and camp until the giant eye thing is dead, I managed to sit there and complete the level only on wave 2

I've found that vortex grenades and occasionally tomahawks are actually very effective - they fill up the focus bar for a long period of time, and also block off lines of sight/hallways. Gives you a minute to breathe!

I used the minigun with smartbullets a lot. Makes the fight with the Patriarch and the Enforcer a lot easier

Also, on Oil Rig, literally just firebomb the stairwell and the hallway in the spawn building and the enemies will kill themselves. Keep it going with incendiary shotguns throughout the level and just murder any stragglers that manage to get past the entire room full of flaming bodies.
Also, for the final boss, call an Assault Squad/whatever squad, and stand in the doorway to the outside right next to the supply crate/your spawn. Your assault squad won't be able to leave to take up positions, and will be stuck right next to the door the guy spawns out of. They'll just kill him for you.