1. You DONT know how good it is. So what if you've played with it once? Its a guaranteed two shot head shot. It should be hard to get.
2. It is a gun literally made for crucible. Why would you play PvE for a PvP gun
3. Literally anyone can do the thorn bounty even if they're bad at crucible. All you have to do is camp.
You just sound like you're terrible at this game and want things to be easier
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Not to mention if you're getting 25 kills per game even of you die 5 times per game then you can still do it in 5 crucible matches. Me and all of my friends did this in vanilla destiny w/ atheon's epilogue and we did just fine. You can do it with HoW guns for sure