Problem with AIM to SHOOT script

I'm having a problem with a script, I'm really new to to coding but I don't see anything wrong with it. The script makes you have to hold down FIRE2 to press FIRE1 to shoot. Whenever I hold down FIRE2 and press FIRE1 it just won't shoot. It works when I take out the line with having to use FIRE2.

If anyone knows what I'm doing wrong with this code, I need help. Thanks in advanced!

 var projectile : Transform;
 
 function Start() {
 }
 
 function Update() {
     
     if(Input.GetButtonDown("Fire2")) {
         if (Input.GetButtonDown("Fire1")) {
             var Clone : Transform;
             clone = Instantiate(projectile, transform.position, transform.rotation);
             clone.rigidbody.AddForce(clone.transform.forward * 1000);
             rigidbody.AddRelativeForce(Vector3.forward * Time.deltaTime * 1000);
             Physics.IgnoreCollision(clone.collider, collider); 
         }
     }
 }