The Bottomless Mags is one of Moze's Skill Trees in Borderlands 3.
Moze
Minigun
Cloud of Lead
Dakka Bear
Matched Set
Let Off Some Steam
Stoke the Embers
Redistribution
Scrappy
Salamander
General Winter
Rushin' Offesive
Scorching RPM's
Fuel Economy
Exploding. Bullets.
The Iron Bank
Specialist Bear
Chemical Warfare
Some For The Road
"Click, Click..."
Molten Roar
Forge