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The best frame hands down for dealing damage would have to be the sharpshot frame, especially in a party situation. Just make sure you have the proper attachments for it to maximize its damage output (ranged accuracy to start). It is also a good idea to start leveling your automaton's ranged skill early. If you prefer better soloing earlier (which you will likely end up doing the majority of your career as PUP) then you should stick with the harlequin frame, which is a good all-around frame.