SR-7 with 12x scope, really I don't even know why they have other weapons. If you want to know the real problem with infs, its that stupid freaking directional damage indicator! How do you defeat the stupid directional indicator? Headshots! Do nothing but headshots and you're golden. Also it helps to be on really high ground, makes it so theres no bullet drop, just put crosshairs on head, goodnight! Was well worth the $7, unlock this weapon seriously.