I've never two-shoted people before when I've used it. Three shots to the face; yes, but two shots; no. The only way this is possible to me is if the user gets a hip fire precision shot. Those do extra damage because of the gun's Last Word perk. But maybe there is a bug where the user is ADS-ing and the game thinks they're not so when they hit a precision shot the game gives the extra bonus damage.
Who knows? This should be looked into though.
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Watch the videos in the post If you would of done that you wojld of seen it.