Originally posted by ClutchLikeBenny
Yeah its patched, limited to 50,000 XP. If you go above 50,000 XP you lose all the XP, shame

But I'm not sure this applies with Challenge XP.
Most probably wont include Challenge XP as you can get around 50k just from them if you do it right per game, say 300 kills with this gun 10k XP, so many kills with a proficiency 10k XP, so many wins a few K XP and so on, Ive had around 40k XP in a game so its possible to get 50K from challenges, then add game XP, wouldnt be fair to block the XP for that.