Do the 300 kills with a gun challenges then switch gun also get every machine pistol level 10 (just keep switching gun when you get the challenge)

SmokeScreen wrote

megab2000 wrote play with a team and get lots of challenges thats how i leveled up and my time is 4 days and im 10th level 80

I call BS on that sir. I got to 9th legit and i was at 7days @ playing 6+hours like daily.

Obviuosly your SH*T then loool, i got 10th in 5 days 2 hours

Your "skill" aside from the conversation which had no relevance to my question in the first place I take it that kill confirmed is a must?