This is going to be huge. 6-shot Goldie when you get a kill it will give a bullet back to you!?!?!?! The PVP aspect is going to be insane.
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It will be unchanged in pvp. The stars would basically have to align for someone to make use of the new perk on six shooter, you would have to kill 6 people and then watch a 7th spawn and kill them all before the super runs out. however, it will probably be very cool in pve.