Problem with adding 1 element of an array to a list

well the tiltle says it here is the error i get: Assets/scripts/AddItem.js(29,28): BCE0048: Type 'System.Type' does not support slicing.

here is the script where the item is what i want to add.

 #pragma strict
 
 import System.Collections.Generic;
 
 var Inventory : PlayerInv;
 var GUISKIN : GUISkin;
 var Weapons : WeaponInfo[];
 class WeaponInfo
 {
    var GO : GameObject;
    var name : String;
    var icon : Texture2D;
 }
 
 function Start ()
 {
     Inventory = GetComponent(PlayerInv);
 }
 
 function OnGUI()
 {
     GUI.skin = GUISKIN;
     for(var Weapon : WeaponInfo in Weapons)
     {
       GUILayout.Label(Weapon.icon, GUILayout.Width(300));
       if (GUI.Button(Rect(0,0,306,156),""))
       {
           Debug.Log("You Choose The AKS74U");
           Inventory.Inv.Add(WeaponInfo[0]);
       }
     }
 }

here is the script where i want to add it to:

 import System.Collections.Generic;
 
 var Inv = List.<itemclass>();
 
 function Start () {
 
 }
 
 function Update () {
 
 }