Roll 1: Grenadier, quick draw, rifled barrel, life support, danger close
Roll 2: Zen moment, quick draw, braced frame, triple tap, eye of the storm
Roll 1 seems more PVP due to the range boost (this hc has abysmal range) while roll 2 seems more PVE oriented.
Roll 3 is simply terrible thus I didn't list it.
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I like roll 2. Personally. Especially for pvp.