Trace rifles should be considered an auto rifle, in regards to armor mods, and current/potential exotics, because if i want to go say cold heart, and i want an ammo scavenger or finder mod, i can't cause it doesn't exist.
(i chose auto rifles because in Y1, to infuse an trace rifle you needed an auto rifle)
{^^, shows my age with this game. if you are a new(ish), player and don't know what i'm on about, in the OG D2 infusion system to infuse a weapon you needed the same weapon type (sniper, SMG) of a higher level to infuse}
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Bungie made it a while back so all auto rifle perks apply to trace rifles, except for scavengers