Well I kinda forgot but I was keeping it in vault and thought it can three headshot kill in Crudible soo i need perfect roll for it.
Zen Moment/Flared Magwell/Third Eye
or
Outlaw/Armor Piercing Rounds or Send it/Third Eye
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Firefly, and Outlaw help a ton. You see that pretty little explosion, clear a room, reload in half a second, then keep on shooting.