take random weapon (script java) need help

I want to make a mario style game and i want to make it so that a game object will give me a random weapon when i drive my problem when i have the weapon i like to shoot one time when i press 'fire1' then i can't shoot .. i dont know why when i take my wweapon i still shoot every time . this is my script :

 var speed :float = 400 ;
 var testweapon : boolean   ;
 var existeweapon : boolean ; 
 public var weapons : Rigidbody []   ;
 
 
 var weaponOfRandomChoice : Rigidbody ;
 
 
 
 function Update () {
 
 if ( testweapon==false){
 if (weaponOfRandomChoice == weapons[0]){
 
   if(Input.GetButtonDown("Fire1")) { var bullet = Instantiate(weaponOfRandomChoice,transform.position,Quaternion.identity) ;
         bullet.velocity=transform.TransformDirection(0,0,speed);
         testweapon=true ;
 }}
       
       
       else if (weaponOfRandomChoice == weapons[1])
 {
   if(Input.GetButtonDown("Fire1")) { var bullet2 = Instantiate(weaponOfRandomChoice,transform.position,Quaternion.identity) ;
         bullet2.velocity=transform.TransformDirection(0,0,speed);
         testweapon=true ;
   }}    DestroyImmediate(weaponOfRandomChoice);}
 
 
 
 
 function OnTriggerEnter (Boost : Collider) {
 if(Boost.gameObject.tag=="Box"){Debug.Log("box");
       weaponOfRandomChoice= weapons[Random.Range(0, weapons.length)];
       testweapon= false ;}
       
    }