Assault rifle expertise part 3 in insane

The AR expertise part 3 of 5 is looking impossible. I finished the SMG one already and the shotgun I'm on part 2 and getting through. The AR though is to hit 100 people with assault rifles in a SINGLE MATCH. I don't know if hitting the same player multiple times counts but even then it's going to be hard. The issue is that there aren't even 100 players in the lobby. Even if it counts you hitting the same player it's still near impossible. The only way I can see doing this right now would be maybe in team rumble or another mode other than BR. I only unlocked it yesterday and tried a few times but it seems crazy. The shotgun one is hard but possible just the number of times to do things is high but possible over time. Perhaps later levels get crazy on shotgun but level 3 are is nuts right now. If anyone knows how to complete this let me know as well as anyone else struggling with this. If it works in team rumble or creative I'll try to update. If I find another way I will too.