Carbines are generally defined as shorter versions of larger assault or battle rifles. They are a type of weapon available to any player class. These weapons are somewhat like assault rifles in that they have large magazines and fire similar calibers of ammunition, but provide less damage compared to them. They also have good RoFs to keep them competitive.
All players start with the M4A1 carbine, a dependable weapon for running about and scoring the first kills for a player.