"The LAR fires a three-round burst, and the scope allows it to engage targets at great distance." In-Game Description.
The Light Assault Rifle fires an automatic three-round burst every 0.072 seconds, allowing the player to get off quite a few shots when mastered. It has a scope which allows it to engage targets at long distance. This is not a hitscan weapon so players must lead their targets.
This weapon is primarily used by chasers who need to kill and enemy capper without having to catch up to him.