Burst Fire is a mod for 40mm Cannon that appears in Titanfall. It modifies a weapon to fire in a three-round burst, rather than semi-auto. This mod significantly lowers the damage and accuracy of individual shots, and increases ammo capacity to 21.
This mod is especially useful in downing pilots and minions, as it still does high damage to them with both direct hits and blast damage. It also makes it easier to hit enemy titans as well. The major drawback to this is the lowered damage, which is almost half the original. It takes much more lead to down enemy titans and dropships.