NOTE: THESE ARE IDEAS BEING THROWN AT THERE AND MAY OR MAY NOT BE BAD
Most of the ARs are pretty usable but there are a few that just are so underwhelming and underpowered. Mainly SG550, ACR, and AUG A3. All of them have fairly low shots to kill and times to kill that make them much harder to use and just downright worse options in fights. SG550 granted still is somewhat usable but could do with a buff of some sort. ACR is just a glorified pepper gun that has a high shots to kill but a decent firerate. It's still slower than most of the other guns though. The Aug A3 is just the worst AR in the game imo. Extremely high ttk, high shots to kill. The only reason the Famas that has more shots to kill than any other ar can get away with that is because of firerate. It'd be nice to have a usable aug with maybe a faster fire rate or something to make it more enticing to use.
The Vector is just insane but it's not being used as much since 74 has risen back up into popularity. Though, it does shred at a longer range than it really feels like it should. I feel like part of that is due to an unnaturally high mag capacity for the start. It has 40 shots a mag where most of the times i remember other games keeping it at 25 for balance purposes so that survivability wouldn't be a problem. Also maybe some increase in either ability to control or initial kick would help with it being able to beam from ranges that it really just shouldnt.