Having trouble with Instantiate

I'm trying to shoot a bullet out of an empty attached to a gun. I'm using instantiate but it keeps telling me that I'm using it wrong and that it can't convert Vector3 to Quaternion in my instantiate line. What am I doing wrong?

 public GameObject barrelEnd;
     public GameObject bullet;
 
     void Update () 
     {
 
 
         if (Input.GetMouseButtonDown (0)) 
         {
 
             barrelEnd.transform.rotation = Quaternion.Euler (barrelEnd.transform.rotation.x, barrelEnd.transform.rotation.y, barrelEnd.transform.rotation.z);
 
             GameObject.Instantiate (bullet, barrelEnd.transform.position, barrelEnd.transform.forward); 
 
         }
 
 
     }