This is the easiest and safest way I've found to farm bolters on Nightmare mode. I used an explosive arrow just for good measure, but I suppose you could use something else. A gun or a grenade maybe. However you kill the bolter is fine. All I know is that the volatiles can't seem to get you up there. Kill it, wait out the night and take the bolter tissue when the coast is clear. Watch out for runners though. If your low on explosive arrows then keep sleeping through days at a place with a store to restock what they have until they have explosive arrows, and buy them. Nice and easy. Unfortunately you'll need to have a grappling hook to get to the optimal position. Good luck!
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