Who uses it, how often and what are your thoughts on this attachment? I decided to try this for the calling card (500 kills I'm guessing) and find that it's an ok gun. I say ok and not anything above since the Ballista is still a hit marker machine. However when you get a kill it is rather amusing. Also if you want, what do you put with your class? I'm using 5 perks (Flak/Toughness/Cold Blooded/Dexterity/Tac Mask) and a Five-Seven.