I messed up and chose the graviton. I was tired and i got it not realizing the risk runner was 1 of the 3 options on that quest. Is there another way to get it? I really want that gun.
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The first character to reach that section of the story will have all three options available. The second character will have the other two options available and the final character will only have the one final option available. So a guaranteed way would be to run the story again on a new character.