So with lnucklehead getting a HUGE nerf it made it not good for pvp now as the duration to relieve the marker is about the same time for most ttk guns in the game, so kinda pointless to use now. Once you break guardian shield you also have to hit them AGAIN to even have the mark placed so yeah.
What is possible new meta for pvp hunter exotics that could show some light, get there time to really shine. I been enjoying lucky pants myself with Last Word.
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Forget about meta, knucklehead is still going to be very useful. I never used it for the damage perk, mainly for the radar. Lucky Pants also seems quite popular with the HC build.