coliders are not working

hey, so i`m making a game and the bullets that hit the player are damadging him but the ones that hit the ennemy are not, the player is a capsule all made in Unity but the gun, the turret was fully made in cheeta 3D so I added a box colider to it and tried just adding coliders in the prefab options annyway I cant find a reason for this to hapen other than a bug. so here are the codes I used.

 // under update in the shooting code
 if(Input.GetButtonDown("Fire1")&& fire)
     {
         if (auto){}
         
         else
         {
         clone = Instantiate(projectile, transform.position, transform.rotation);
         clone.velocity = transform.TransformDirection( Vector3 (0, 0, speed));
         AudioSource.PlayClipAtPoint(sound, transform.position, 1);
         bulletAmount -= 1;
         }
     }    


 // under the health script and update
 var dead = false;
 var health = 100;
 var damage = 10;
 var player = true;
 var ennemy = false;
 var PlayerHealthDisplay: GUIText;
 
 function DisplayAmount () {
     PlayerHealthDisplay.text = "" + health;
 }
 
 function Start () {
 
 }
 
 
 
 function OnControllerColliderHit(hit : ControllerColliderHit) 
 {    
     
     if (hit.gameObject.tag == "fallout")
     {
         dead = true;
     }
     
     if (hit.gameObject.tag == "bullet")
     {
      if (player)
      {
      health -= damage;
      }
      if (ennemy)
      {
      health  -= damage;
      }
     }
     
     if (health < 1)
     {
     dead = true;
     }
     
 }
 
 function Update()
 {
         if (dead && player)
        {
            Debug.Log("Died, Respawning!");
            health = 100;
            transform.position = Vector3(-9,2,-48);
            dead = false;
        }
        if (dead && ennemy)
        {
                Destroy(gameObject);
        }
        
 }

 // and under the bullet code
 var lifeTime = 100;
 
 
 function Awake()
 {
     Destroy (gameObject, lifeTime*Time.deltaTime);
 }
 function OnCollisionEnter(collision : Collision)
 {
     Destroy (gameObject,0.1);
 }

sorry for the ton of code and thank you all