For me it would be High-Caliber Rounds, Perfect Balance, and Counterbalance.
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Thanks for the help
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No problem. If you want to see potential perk rolls for the Extremophile 001 (or any weapon/armor piece) you can look up the Planet Destiny Database. This database is (to my knowledge) extremely accurate as the information they have is pulled directly from the game itself and is not user-generated data.