Compound bow build guide | Once Human 

Showcasing at the end is proof it's a perfectly capable build :) I can also easily solo Forsaken Giant with it.
Bomber procs have stagger effect here by default on normal/elite mobs, so the default bomber proc here is stronger than jaws, and its every hit (when stacks are up, and they will be up most of time)
Calibrations in purple/orange quality do exist, but generally crossbow drops are very rare, so unfortunately its hard to find one =\
Substat priority:
- magazine capacity, you have to get 50% magazine capacity for 2 arrows, this is top priority
- crit dmg, you will have incredibly high crit rate, crossbow stacked up gives 30% for 6s after crit + shaman vulture top 35% after bomber (which is every hit) for 3s + lonewolf 4p 8% on reload for 2s
Most of time you will maintain all 3 of those stacks, which is + 73% crit chance
- reload speed, because of the small magazine size, reload speed has huge impact on the overall firerate
Items:
4p lonewolf
1p renegade, I am on a server which didn't have lonewolf in wish machine, so I took renegade mask as I could up the blueprint stars, mask gives most psi and bomber dmg is based of PSI
Shaman vulture top
For mods:
You could replace feet mod with Covered Advance. I chose slow and steady as I had a very good roll on it
chest mod could be any, only substats really matter. I don't think blue crit rate/crit dmg mod is good for this build, as overall you will get very low substats on it.