Filling up an array with GameObjects

I'm working on a weapon customisation script. In my weapon manager script I have:

var firstguns : GameObject[];

Which defines the weapon I begin with. So how do I make it like if Gun1 is active then add it to the firstguns variable Currently I have two other scripts related to this

Customisation Script(Attached to camera for the customisation): #pragma strict

 private var wm : WeaponManager;
 var no : int = 0;
 
 function Start () {
 
 }
 
 function OnGUI () {
 
             if (GUI.Button(new Rect(Screen.width / 2 - 0, Screen.height / 2 - 200, 200, 50), "Next Weapon"))
             {
                 no++;
             }
             if (GUI.Button(new Rect(Screen.width / 2 - 200, Screen.height / 2 - 200, 200, 50), "Previous Weapon"))
             {
                 no--;
             }
 }

And then listNo(Attached to gun itself): #pragma strict

 var index : int = 0;
 var model : GameObject;
 
 private var cusGO : GameObject;
 private var cus : Customisation;
 
 function Start () {
 cusGO = GameObject.Find("Main Camera");
 cus = cusGO.GetComponent(Customisation);
 }
 
 function Update () {
 //Visibility
 if(cus.no == index){
 
 model.active = true;
 
 }
 
 if(cus.no != index){
 
 model.active = false;
 
 }
 //====================================================
 }