u/peoplelikedogs06

Basically title, am looking for a place where I can farm weapon upgrades (like the full auto 1,2 and 3 for the launcher or leach 1,2 and 3 for carbine)

Currently I farm through abyssal in the dungeon part at the bottom floor where the spawner guy with a shield essentially infinitely spawns the small kamikaze dudes but was wondering if there is a better/ more efficient way of doing it.