shity damage. SWAT4 damage is the best I ever saw in a FPS.
HIT-damage
legs:(ficas coxo) you get slower.(if you it CPU guys' kneecaps they get incapacitated, they fall but but it doesn't count as death)
arms: you loose accuracy, aiming precision, but if they hit you in the left arm and your holding a pistol you don't lose much. CPU guys drop their weapons.
chest:you loose your armour
shoulders:players loose accuracy, CPU guys drop their weapons.
Head: you die if you dont have helmet.
There are also diferent tipes of ammo. Armor piercing and hollow point, hollow point doesn't go through vests but does more damage to flesh.