Access a GameObject through it's tag, using a string.

In a weapon pickup script i have, The script i have should find a gun, based upon it's tag. In order to reuse this script instead of having 9 different ones, I added a string variable called gunname.

 var gun : GameObject;
 var myself : GameObject;
 var player : GameObject;
 var gunname : String;
 var ammo : gunswitcher;
 
 var isweapon1 : boolean = false;
 var isweapon2 : boolean = false;
 var isweapon3 : boolean = false;
 var isweapon4 : boolean = false;
 var isweapon5 : boolean = false;
 var isweapon6 : boolean = false;
 var isweapon7 : boolean = false;
 var isweapon8 : boolean = false;
 var isweapon9 : boolean = false;
 
 var deadtime : float = 30;
 
 var x : float = 0;
 var y : float = 0.25;
 var z : float = 0;
 
 function OnTriggerEnter() {
 
 gun.SetActive(true);
 activate();
 turnoff();
 
 }
 
 function turnoff() {
 
 collider.enabled = false;
 myself.SetActiveRecursively(false);
 
 yield WaitForSeconds(deadtime);
 
 collider.enabled = true;
 myself.SetActiveRecursively(true);
 }
 
 function Start() {
 
 InvokeRepeating("reset",0,0.25);
 
 }
 
 
 function reset()
 {
     player = GameObject.FindWithTag("Player");
     ammo = player.GetComponent(gunswitcher);
     gun = GameObject.FindWithTag("gunname");
         
 }
 
 function Update() {
 
     transform.Rotate(x, y, z);
 
 }
 
 
 function activate() {
 if(isweapon1 == true){
 ammo.gunactive1 = true;
 }
 else if(isweapon2 == true){
 ammo.gunactive2 = true;
 }
 else if(isweapon3 == true){
 ammo.gunactive3 = true;
 }
 else if(isweapon4 == true){
 ammo.gunactive4 = true;
 }
 else if(isweapon5 == true){
 ammo.gunactive5 = true;
 }
 else if(isweapon6 == true){
 ammo.gunactive6 = true;
 }
 else if(isweapon7 == true){
 ammo.gunactive7 = true;
 }
 else if(isweapon8 == true){
 ammo.gunactive8 = true;
 }
 else if(isweapon9 == true){
 ammo.gunactive9 = true;
 }
 
 
 }

Everything else in the script except line 53 works. I've tried every permutation of the script I know, but nothing has worked. I need help with this.