My gun is only shooting bullets every 8th shot..?

Hello. I have made a simple gun script:

     var projectile : Rigidbody;
     var speed = 20;
      var fireRate = 0.5;
 
       private var nextFire = 0.0;
 
 
          function Update ()
         {
     if (Input.GetButton ("Fire1") && Time.time > nextFire) 
     {
     nextFire = Time.time + fireRate;
     clone = Instantiate(projectile, transform.position, transform.rotation);
     clone.velocity = transform.TransformDirection(Vector3 (0, 0, speed));
     GetComponent.<AudioSource>().Play();
     GetComponent.<ParticleSystem>().Play();
     Destroy (clone.gameObject, 5);
          }
         }
 

However, the gun does not fire every time I press Mouse 0. The audio plays every time but not the bullets.