I'm just sitting right next to someone in moisty mine, someone 2 inches away takes me down to half-health (I was already weak) before he can turn around and run I fires one smg shot and kills him, I had no total health and 2 shotgun shots don't even kill me.
That's so -blam!-, but it wouldn't be as bad if AR's weren't so OP, you can't hit long range shots with them, that's an issue with shotguns.
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https://www.epicgames.com/fortnite/forums/suggestions-advice/74970-feedback-suggestions-bugreport-for-fortnite-battle-royale