Dirty Harriet bugged?

[SpartanJames113]

I'm not sure if its just me or is the rifle awarded from Reaver's Wheel of Misfortune in the Understone pack bugged? The Hit-Woman perk requires you kill 150 enemies with flourishes, but despite the endless stream of mercs I kill out in the wilderness by holding down X or Y the bar doesn't seem to budge.

Is it just that I have to kil witb the rifle's flourish or is it bugged?

EDIT: I'm an idiot, didn't realise Rifles can flourish too. My mistake.