Head shoot and body shoot not working with realistic fps characterDamage

I made a script to headshot and bodyshot but its not working i am using realistic fps and its is not detect the proper raycasthit please help me

public void ApplyDamage (float damage, Vector3 attackDir, Vector3 attackerPos, Transform attacker, bool isPlayer, RaycastHit hit)

 {
     //    Debug.Log (attackDir);
     if (hitPoints <= 0.0f) {
         return;
     }

     if (hit.collider.GetType () == typeof(CapsuleCollider)) {

         if (hitPoints - damage > 0.0f) {
             hitPoints -= damage * damage;
             //Debug.Log (hitPoints);
         } else {
             hitPoints = 0.0f;    
         }
     } else if (hit.collider.gameObject.name == GameObject.FindGameObjectWithTag ("Headshot").gameObject.name) {
         Debug.LogWarning ("Working with sphare collder");
         if (hitPoints - damage > 0.0f) {
             hitPoints -= damage * damage;
             Debug.Log (hitPoints);
         } else {
             hitPoints = 0.0f;    
         }
         Debug.LogWarning (hitPoints);
     }     attackDir2 = attackDir;
     attackerPos2 = attackerPos;        
     if (hitPoints <= 0.0f) {
         Debug.Log ("print die is working");
         SendMessage ("Die");//use SendMessage() to allow other script components on this object to detect NPC death
     }
 }