Trying to make a gun, but it wont work? Please help.

I have been working on a game for some time now and I'm trying to make a FPS. My problem is that it doesn't do damage to the robot? Please help. Ill send the RobotScript, and the Shooting Script.

Shooting Script

using UnityEngine; using System.Collections; using UnityEngine.Networking;

public class Shooting : NetworkBehaviour {

 public RobotScript RobotScript;

 public int minWeoponDamage = 25;
 public int maxWeoponDamage = 50;

 public int weoponRange = 100;

 public bool debugMode = true;

 public Camera FPSCamera;

 private void Update()
 {
     Ray ray = FPSCamera.ScreenPointToRay (new Vector2 (Screen.width / 2, Screen.height / 2));
     RaycastHit hitInfo;

     if (debugMode == true)
     {
         Debug.DrawRay(ray.origin, ray.direction * weoponRange, Color.green);
     }

         if(Input.GetKeyDown(KeyCode.Mouse0))
     {
         if(Physics.Raycast(ray, out hitInfo, weoponRange))
         {
             if(hitInfo.collider.tag == "Enemy"){
                 Debug.Log ("Enemy Hit");
                 RobotScript.instance.Health = 10;
             }
         }
     }
 }

}

Robot Script

using UnityEngine; using System.Collections;

public class RobotScript : MonoBehaviour {

 public static RobotScript instance;
 public int Health = 100;
 
 static int MaxHealth = 100;
 public static int DeathHealth = 1;
 


 void Start () {
     instance = this;
 
 }
 

 void Update () {
     if (Health < DeathHealth) {
         Destroy (this);
         Debug.Log("Enemy should be dead");
     }
 }

}

Extra Info

The Robot Script is attached to a Game Object.

The Robot is NOT a player.

The Robot is a enemy.

The Robot has a tag called "Enemy", on it.

Thanks for taking your time reading, and for helping!