For all Snipers in project blackout QQ'ing is a essential part of the game, and just recently I've found "the fastest way to qq". However using this requires a Gaming Keyboard and or Mouse with customizable macro buttons. I use a "Logitect G700". You must have your Keyboard and or Mouses software installed and all you will need to do it edit your prefred button to hit "Q" two times". by far this is the fastest QQ ive even seen and done before.
-Hope this helps