The Exotic [b]Scout Rifle[/b] "Symmetry", unlike most other Scout rifles and Auto rifles, is not able to pierce barriers, such as Hydra Shields or Hobgoblin shields, when the seasonal mod "Anti-Barrier Scout Rifle". It is still able to pierce champion shields and proc a stun, but in every other instance I've tried it, it will not pierce normal barriers.
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I've noticed this as well