Just to start off i already have gjallahorn and have had it for quite some time now and honestly i think if xur sells gjallahorn i might never play any pvp game mode again. I already dread the moments when i hear "heavy ammo inbound" can you imagine a full team with gjallahorn all with 4 shots!? I can and it spells R A P E! Game over! Just do yourselves a favor and never sell that gun!
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The only think that will happen is all the "earned-Gjalla" players will come out of the woodwork. In regards to PvP, I've only seen Thunderlord and Truth take up the exotic slot for heavy. In all other cases Vex, Thorn, Hawkmoon, Icebreaker, and Invective are used.