Before you people blow 100 motes, please understand you CAN NOT roll firefly on Timurs lash, only scouts and snipers.
You want firefly on a hand cannon you need Fatebringer.
That is all.
Edit: Here is a link with the entire possible perk tree for Timur's Lash, use the site for any gun you want to reroll. I find just googling the gun you want and planetdestiny works great. For example: Gheleon's Demise Planetdestiny
[url=http://db.planetdestiny.com/items/view/337037804]Timur's Perk Tree[/url]
For those who don't want to click the link I'm going to list the perks:
[b]Sights:[/b]
Steadyhand
Truesight
Fastdraw
Sureshot
Quickdraw
[b]First Perk:[/b]
Clown Cartridge
Outlaw
Return to Sender
Rangefinder
Hip Fire
Performance Bonus
Zen Moment
Spray and Play
[b]Secondary Perk:[/b]
Quickdraw
Field Scout
Lightweight
Perfect Balance
Flared Magwell
Single Point Sling
Send It
Skip Rounds
Explosive Rounds
Armor Piercing Rounds
High Caliber Rounds
[b]Final Perk:[/b]
Crowd Control
Grenadier
Luck in the Chamber
Final Round
Life Support
Mulligan
Reactive Reload
Third Eye
Who's Next?
Good luck everyone, hope you get the one you want.
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Just as an FYI, their information is incomplete. It is possible to get Who's Next in the final perk slot. I know because I have it on mine, along with Spray and Play and Perfect Balance/Field Scout :) Additionally, the effects of Spray and Play and Who's Next DO stack, so a kill with the final round gives a really, REALLY fast reload speed.