Barrett is the worst main weapon in the game, it sees barely any play in competitive play.
The reason as to why M79 and Barrett are leading in kills is because everyone plays them, because they want the 1 hit 1 kill, and want to be "epic snipers".
Just fix that f****** bug when proning in the air.
IMHO legs shot should not be lethal also other weapons should be able to zoom in a lil bit... Cause there's no chance with barret on open space.
Then you may as well remove the weapon, as it'll not see any competitive play, it'll be completely useless.