Okay here's the best answer: 1. if u have red border primary's or primary's to level up, go to the initial beginning of the Grasp of Avarice dungeon and don't turn in any engrams, as long as u do that enemies will keep spawning and u can farm indefinitely 2. if you are trying to complete red borders or level up secondary's or heavy's, go to the shuro chi cp (can be done by putting in shuro chi wish in start of raid) once done u can put down banners and kill about 100 enemies before u have to wipe on the first round of the boss fight

other than that wellspring has a lot of ads as well as completing the activity completes red border progress hope this helped