Crit Fl4k Leveling

Fl4k Leveling Paste (works with original version of the game, might be nerfed later)

Guns to look out for:
Torgue shotguns
Any good legendary
Torgue shotguns
Maybe torgue pistols
Definitely torgue shotguns

First tree:
https://borderlands.com/en-US/characters/fl4k#t=%22cb__2015308718___p__117127705-5_1127977552-3_2675403350-3___e__1618958551-2811446764_52532438-447597971_772024924-3793471331%22

Start with either the red or green tree, either work. Once you've got both you can infinitely shoot sticky torgue shotguns during fade away. I thoroughly recommend getting a torgue shotgun asap. Persistence Hunter will up the duration to a bit over 11 seconds, allowing you to deal even more damage.

Second tree:
https://borderlands.com/en-US/characters/fl4k#t=%22cb__2015308718___p__117127705-5_281565876-5_3876256157-5_4171864922-1_3579448174-2_1127977552-3_4162841610-3_2675403350-3___e__1618958551-2811446764_52532438-447597971_772024924-3793471331%22

You wanna go for head count asap, it will allow you to refresh your fade away by timing the torgue reload/mode switch with the end of fade away. You can effectively infinitely sustain fade away this way. After this you wanna go for either eager to impress or overclocked and then grab lick the wounds. Lick the wounds is op. It's seriously absurdly strong. After that pick up the other.

Third tree:
https://borderlands.com/en-US/characters/fl4k#t=%22cb__2015308718___p__117127705-5_281565876-5_3876256157-5_4171864922-1_2927115417-1_848128962-5_1474023286-3_2030200031-1_3579448174-2_1127977552-3_4162841610-3_2675403350-3___e__1618958551-2811446764_52532438-447597971_2011892216-2744910560_772024924-3793471331%22

Round out the rest of the green skills, we might revisit turn tail and run later, it is good but there are solid options to get here that are more important. You can swap to the smg jabber now too. Pick up Unblinking eye here too.

Final tree:
https://borderlands.com/en-US/characters/fl4k#t=%22cb__2554538832___p__117127705-5_281565876-5_3876256157-5_4171864922-1_2927115417-1_848128962-5_1474023286-3_2030200031-1_3579448174-4_1127977552-3_4162841610-3_1546991626-5_3024594450-3_2675403350-3___e__1618958551-2811446764_52532438-447597971_2011892216-2744910560_772024924-3793471331%22

Round out the rest of the red tree, there is 1 floating point left and you can choose where to put it. I'll be putting it in turn tail and run, but it can go anywhere.