Timur's Lash can be a devastating weapon. You need to look for either 'Field Scout' or some quick reload buff if you are going to be stuck with 7 rounds. Also, a damage buff is useful and takes the lethality over the top. My Timur's Lash is as follows:
Zen Moment (Causing damage grants extra stability)
Field Scout
Crowd Control
It's my new favorite PvP primary
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Not if you're looking to use final round or luck in the chamber.