How to make an automatic fire mode for a gun (Javascript)

Hello guys, im new in unity so i want to ask this question... I have a script taken from a Youtube Tutorial. It is a single fire only script but i want to have an automatic gun. Also it would be amazing if there was a "variable" where i can change the delay between each shot, so i can use it to more weapons.

Thanks :) Please don't flame, im really new in unity! Here is the code for the other statistics of the gun (Damage, AllowedRange)

 amageAmount : int = 32;
 var TargetDistance : float;
 var AllowedRange : float = 100;
 
 function Update () {
     if(Input.GetButtonDown("Fire1")) {
 
         var Shot : RaycastHit;
             if (Physics.Raycast (transform.position, transform.TransformDirection(Vector3.forward), Shot)) {
                 TargetDistance = Shot.distance;
                     if (TargetDistance < AllowedRange) {
                         Shot.transform.SendMessage("DeductPoints", DamageAmount);
                     }
                 }
             }
         }

And here is a script which i use to play animations and sounds! (Fire1 = LeftMouseButton)

 function Update () {
     if(Input.GetButtonDown("Fire1")) {
         var gunsound : AudioSource = GetComponent.<AudioSource>();
         gunsound.Play();
         GetComponent.<Animation>().Play("GunFireAK");
         GlobalAmmo.LoadedAmmo -= 1;
     }
 }