Tier 9 needs a Summon Dragon.
Tier 1: Healing Bullet (ST Ally Heal) - Pistols
Tier 2: Hulk Bullet (ST S/L Resist / +DMG) - Dual Weild
Tier 3: Healing Barrage (Target AOE Heal) - Hail of Bullets
Tier 4: Phoenix Bullet (Target Defeated Ally and Rez's them) - Piercing Rounds + Phoenix Rising
Tier 5: Necro Bullet (Target Defeated Enemy to create temporary spirit ally - Equal to Necro MM's Blast Pets) - Suppressive Fire
Tier 6: Suppress Target ( ST Medium Damage, Light -Regen, Hold) - Empty Clips
Tier 7: Self Inflicted (S/L/P/T Resist, +Regen, +DMG, Mez Resist) - New animation
Tier 8: Destroy Target (ST High Damage, Heavy -Regen, -Recharge, -Resist) - Execution Shot
Tier 9: Summon Dragon (Shoots ground and summons a stationary dragon that rises from the ground and blasts enemies)
Can always rearrange them...