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Didn't even read this comment and just posted my own lvl 133 run with almost all of this stuff

The best weapon:  (3 shots bosses) (Lvl. 133)

Stock: Reversal stock

Grip: Bounce grip

Trigger: 5x Burst

Mag: Spinshooter Mag (The one that shoots while reloading)

Barrel: Quad Barrel

Ammo: NUKES

*If you only have  4 or 5 of these at once, it's ok once you get the final one, the damage multiplies x10 at least*

The only hard part is the noise/the blue arrows b/c you can't see your guy in the explosions.