Ammunition is an important item, which is needed for all weapons with the exception of the Auto Charge Pistol. Ammunition comes in small, gray Ammo Packs, which give different amounts of ammo. The ammo is universal for all weapons; that is, using up ammo with one weapon means there will be no ammo for the other weapons. The amount of ammunition used for each shot depends on which weapon is fired. As well as being scattered throughout the levels, ammo packs can be obtained from friendly Bio-Techs.