Experimental Bow/Bow NB for U50s.

Front:
Venom Arrow - Your main source of Major Brutality. Keep buff up. Double function as a secondary ranged interrupt/stun.
Acid Spray - Your spammable DOT on groups. Benefits from Swamp Raider set for extra damage. (Burst damage potential still low, just better).
Impale - Your ranged execute. Save for targets under 25%.
Ambush - Your main stun (from flank). Stun, dodge roll back, hit bow ultimate for decent burst. Grants empower for stronger heavy attacks.
Shadowy Disguise - Survivability and a guaranteed crit from stealth.
Toxic Barrage - Big poison damage ult boosted by Swamp Raider.

Back:
Phantasmal Escape - Major Evasion buff, and recast to remove snares.
Magnum Shot - Knockback. Purely for keep pressure off, allowing rebuffing or escape.
Concealed Weapon - More speed in stealth/invis for better survival/kiting. Tertiary stun (from flank) for backbar.
Resolving Vigor - Big selfish heal buffed by Heartland Powered bow on backbar.
Mark Target - Main debuff and detection.
Bolstering Darkness - Your emergency survival heal/buff ult for group play.