I've seen similar crit builds but this what I feel most comfortable with personally. The reason why I didn't put any points in TWO F4NG for extra projectiles was because Lucian's/Rowan's Call ricochete 2 homing bullets every crit hit and returns 2 bullets into your mag. With MEGAVORE and FADE AWAY you'll have critical hits all day dealing massive damage.
The Butcher/Conference Call
LCM: Bounty Hunter