The gun tower is a racing weapon used in the sport Combat Racing in Jak X: Combat Racing. Once deployed, it will remain stationary on the track for 30 seconds and shoot the first target that comes within range with its sub-machine gun until the target leaves it range, it will ignore other vehicles in the meantime. Gun towers can be destroyed by the vulcan fury and Fragmentation Grenades or simply by driving through it which deals no damage to your car.
To effectively use the gun tower, place it in a sharp turn or corner, where other racers are forced to drive slow to make the turn effectively. It is useless in long stretches or big open section as racers will either quickly boost past it or simply destroy it.