Uhh... I don't won't to argue because, it's really not that big of a deal. But...
Obviously different guns have differant TTK times for example: the razor back kills 100x faster than any gun in Aw, plus if you get a headshot it speeds up the process even more.
So in reality it's hard to tell, if anything it's a slight differance no matter what you think.
P.S most youtuber a don't know shit.
English
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The vesper kills faster than the razorback at 1100 RPM, is the fastest killing SMG in the game. A lot of people use the razorback because it's easier to use, but much better smg's are available. TTK is difficult to say because the beta is online, laggy lobby's can give different results. I personally feel it's longer than AW and ghosts. TTK can still change in the final game, if you think it's fast leave feedback on tweeter or the ops 3 forums.