Why does my AI miss me every few feet?

If I am standing right in front of him he will hit me then if I back up a little he will start to miss me. After a few more feet back he will start hitting me again. I think I know the problem but not sure how to fix it. this is the code I have and all the info I think you will need to help me.

On my Bullit prefab I have the following set of var's

Mass: 0.1

Drag: 0

Angular Drag: 0.05

Use Gravity: True

Is Kinematic: False

Interpol: None

Collision Detection : Discrete

Constraints: None

This is the code on my AI

 var LookAtTarget : Transform;
 
 var damp = 6.0;
 
 var bullitPrefab : Transform;
 
 var savedTime = 0;
 
 function Update () 
 {
     
     if(LookAtTarget)
     {          //           Finds the dif between the two         Player position                      Turret Pos
         var rotate = Quaternion.LookRotation(LookAtTarget.position - transform.position);
         
         
         //   rotation of the turret                                  turret rotation,      var,   time that passes between frames
         transform.rotation = Quaternion.Slerp(transform.rotation, rotate, Time.deltaTime                                                            *
                                                             damp);
         
         var seconds : int = Time.time;
         var oddeven = (seconds % 2);
         
         if(oddeven)
         {
             Shoot(seconds);
         }
     }
     
     
 }
 
 function Shoot(seconds)
 {
     
     if(seconds != savedTime)
     {
         var bullit = Instantiate(bulltPrefab, transform.Find("SpawnPoint").transform.position, 
                                     Quaternion.identity);
                                     
         bullit.rigidbody.AddForce(transform.forward *1000);
     
         savedTime = seconds;
     }
 }

And This is my code on my buillit prefab

 function OnCollisionEnter(hit : Collision)
 
 {
 
     if(hit.gameObject.tag == "Player")
     {
         HC.LIVES -=1;
         
         Destroy(gameObject);
     }
 
     if(hit.gameObject.tag == "turret")
     {
         
         Destroy(gameObject);
     }
 
 }