Hey Guys, i updated my tool as it has been requested by some users.
So here is a little 25k XP Trainer for v16 (while double xp weekend this will get you around 50k XP):
It "sets" your Challenges (Grizzled Veteran, Career Kills and SMG Kills to 1 before you complete the last Challenge Tier) to 1 "point" before completion.
To get the full use play any gamemode with a smg equipped and get 1 Kill.