Problem with multiple scripts

I have two scripts, one which control my guiText on screen and another which handles the bull of the firing mechanics.

What i would like is to increase my score every time i destroy an enemy but as of now it happens every time i fire. Anyone able to help me out?

Here is some of my cannon script:

 if (Input.GetButtonDown("Fire1")) 
         {
             Rigidbody clone;
             clone = Instantiate(projectile, transform.position + offset, transform.rotation) as Rigidbody;
             clone.velocity = transform.TransformDirection(Vector3.forward * force);
             
             if(clone.gameObject.tag == "bullet")
             {
                 Destroy(clone.gameObject, destroyTime);
                 //I want to add score here
                 accelShotHS.score += 1;
             }
         }

Here is the GUIText script:

  public class accelShotHS : MonoBehaviour 
  {
     public static int score;
     public GUIText text;
     // Use this for initialization
     void Start () 
     {
     
     }
     
     // Update is called once per frame
     void Update () 
     {
         guiText.text = "Score: " + score;
     }
 }