Hey there, I found that if you put the Vigilante mods in a sentinel weapon, like the Vulklok, and then equiping a kavat instead of the sentinel, the mod set bonus counter keep them as "active" (having 3 vigilante mods on my Vulklok and one on my rubico gives me the 4th level of the mod set).  Plus, equiping vigilante armement on both the sentinel weapon and your main primary will make the set having "2 mods active" (should not do that cause it's the same set). I think the idea of the s