Bullet trying to set object that doesn't even exist

My bullet is trying to set the game object "gun" to a game object that doesn't even exist in my assets what so ever.

Shotgun2 doesn't even exist in my scene!

It comes up with the error

NullReferenceException: Object reference not set to an instance of an object BulletScript.Awake () (at Assets/BulletScript.js:23) UnityEngine.Object:Instantiate(Object, Vector3, Quaternion)

When I double click on the error it sends me here. Highlighting "if(gun.GetComponent(Gun).aiming == true)"

Bullet Script:

 #pragma strict
 
 var bulletHole : GameObject;
 var floatInFrontOfWall : float = 0.001;
 var maxDist : float = 10000000000;
 var Enemy : GameObject;
 var maxDamage : float = 15;
 var minDamage : float = 5;
 
 var gun : GameObject;
 var blood : GameObject;
 
 //Accuracy
 var minAimAccuracy : float;
 var maxAimAccuracy : float;
 var minHipAccuracy : float;
 var maxHipAccuracy : float;
 
 function Awake () {
     
     gun = GameObject.FindWithTag("Gun");
 
     if(gun.GetComponent(Gun).aiming == true)
     {
         transform.rotation.eulerAngles.y += Random.Range(minAimAccuracy, maxAimAccuracy);
         transform.rotation.eulerAngles.x += Random.Range(minAimAccuracy, maxAimAccuracy);
     }   
     if(gun.GetComponent(Gun).aiming == false)
     {
         transform.rotation.eulerAngles.y += Random.Range(minHipAccuracy, maxHipAccuracy);
         transform.rotation.eulerAngles.x += Random.Range(minHipAccuracy, maxHipAccuracy);
     }   
 }
 
 function Update () {
     var hit : RaycastHit;
     var damage = Random.Range(minDamage, maxDamage);
     if(Physics.Raycast(transform.position, transform.forward,hit, maxDist))
     {
         if(bulletHole && hit.transform.tag == "Terrain")  
             Instantiate(bulletHole, hit.point +(hit.normal * floatInFrontOfWall),Quaternion.LookRotation(hit.normal));
         if(hit.transform.tag == "Enemy")    
         {
             Enemy  = hit.collider.gameObject;
 
         }
         if(Enemy)
             Enemy.GetComponent(EnemyHealth).currentHealth -= damage;
     }
     Destroy(gameObject);
 }

I have other objects in my scene with the tag "Gun" but it doesn't seem to want to use those Please help!