you gotta know how to use an M4, compared to bar where you can just sit in a doorway and spam it (you dont even have to move with a bar half the time) or a pbp where one shot of bullets covers 4 times the amount an M4 does (same thing can just stand in one general area and pew pew pew) to use an m4 successfully, you gotta be able to dodge, shoot and know your next move all at the same time.