The rifle can be upgraded to 'retire' dinosaurs (in other words, kill them). Initially in a normal run of the game's main simulation mode, the Barrett is only capable of firing tranquilizer rounds-which will keep dinosaurs sedated for a time-and syringes that are presumably filled with adrenaline, which will awake a dinosaur from a coma. The weapon appears in the hands of Helicopter Rangers, and is used to maintain the dinosaurs in a park, and is also featured in a number of missions based around the 'Retiring' of rampaging dinosaurs. The Barrett M82A1 is the primary firearm that appears in the game.
