Diamond camo is unobtainable for the Hellion Salvo. I have all non-DLC secondaries gold/diamond, but I can't equip diamond on it. u/ATVIAssist : r/CODZombies
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Have been playing since Finest Hour, but never really went for gold/diamond in any of the games. One day I accidentally got the Hellion Salvo gold, and thought it was pretty cool.