Whats going wrong in my Scripts?

So I'm trying to make a First Person Shooter for mobile. I have these three scripts but every time i go near my 'enemy' my Gun floats off in to the air, I'm new to coding so have no idea what i've done wrong here

This script is on my Gun:

function OnGUI () { if (GUI.RepeatButton(Rect(10,70,50,30),"Shoot")) GoTriggerHappy(); }

function Update () { if (Input.GetAxis("Shoot")) GoTriggerHappy(); }

function GoTriggerHappy () {

 if(Input.GetMouseButton(0)) {
     var gunsound : AudioSource = GetComponent.<AudioSource>();
     gunsound.Play();
     GetComponent.<Animation>().Play("GunShot");
 }

}

This is attached to an empty game object on my FirstPerson Character :

var DamageAmount : int = 5; var TargetDistance : float; var AllowedRange : float = 15;

function Update () { if(Input.GetMouseButton(0)) {

     var Shot : RaycastHit;
         if (Physics.Raycast (transform.position, transform.TransformDirection(Vector3.forward), Shot)) {
             TargetDistance = Shot.distance;
                 if (TargetDistance < AllowedRange) {
                     Shot.transform.SendMessage("DeductPoint", DamageAmount);
                 }
             }
         }

}

and this is on what i want destroyed:

var EnemyHealth : int = 10;

function DeductPoints (DamageAmount : int) { EnemyHealth -= DamageAmount; }

function Update () { if (EnemyHealth <= 0) { Destroy(gameObject); } } Any help much appreciated

Thanks