Need help with pausing a script when opening pause menu

So I have created a Pause Menu I my FPS game. I have managed to get the Main Camera to pause however whenever you click you will still fire a shout from the pistol. I need a solution where when "ESC" is pressed the pistol script disappears and when the resume button is pressed it reappears. I also have a problem where on the first time of pausing the menu just appears as a still image but if the game is resumed then paused again it works perfectly fine. Thanks guys I will include both PauseMenu and Pistol.

Pistol:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using UnityEngine.UI;
4.  
5. public class Pistol : MonoBehaviour
6. {
7.     // Damage of the gun is set to 10. Range is set to 100.
8.     public float damage = 10f;
9.     public float range = 100f;
10.  
11.     public Camera fpsCam;
12.     public ParticleSystem disperseFlash;
13.     public Transform parent;
14.     public GameObject prefab;
15.     public Vector3 position1;
16.     public Vector3 position2;
17.  
18.     public int maxAmmo = 10;
19.     private int currentAmmo;
20.     public float reloadTime = 1f;
21.     private bool isReloading = false;
22.  
23.     public Animator animator;
24.  
25.     public int ammo;
26.     public bool isFiring;
27.     public Text ammoDisplay;
28.     public bool reloadText;
29.  
30.     void Start ()
31.     {
32.         if (currentAmmo == -1)
33.         currentAmmo = maxAmmo;
34.     }
35.  
36.     // Update is called once per frame
37.     void Update()
38.     {
39.         if (isReloading)
40.             return;
41.        
42.         // When "R" is pressed the reloading animation is played and currentAmmo is set to maxAmmo(10).
43.         ammoDisplay.text = ammo.ToString();
44.         if (Input.GetKeyDown(KeyCode.R) && !reloadText && ammo <= 9)
45.         {
46.             reloadText = true;
47.             ammo = +10;
48.             reloadText = false;
49.             StartCoroutine(Reload());
50.             return;
51.         }
52.      
53.             //This fires a Raycast when Fire1 or Mouse1 has been pressed.
54.             if (Input.GetButtonDown("Fire1"))
55.         {
56.             Shoot();
57.         }
58.        
59.         //When "Fire1" is pressed the currentAmmo count is declined by -1.
60.         ammoDisplay.text = ammo.ToString();
61.         if (Input.GetButtonDown("Fire1") && !isFiring && ammo > 0)
62.         {
63.             isFiring = true;
64.             ammo--;
65.             isFiring = false;
66.  
67.         }
68.  
69.  
70.  
71.     //Reload animation delay and raycast firing delay.
72.     IEnumerator Reload()
73.     {
74.         isReloading = true;
75.         Debug.Log("Reloading...");
76.  
77.         animator.SetBool("Reloading", true);
78.  
79.         yield return new WaitForSeconds(reloadTime);
80.  
81.         animator.SetBool("Reloading", false);
82.  
83.         currentAmmo = maxAmmo;
84.         isReloading = false;
85.     }
86.  
87.  
88.  
89.  
90.     //Raycast casts a ray within the range set then provides an output in debug log if anything has been hit.
91.     void Shoot ()
92.     {
93.         //Plays Particle System
94.         disperseFlash.Play();
95.  
96.         currentAmmo--;
97.  
98.         RaycastHit hit;
99.         if (Physics.Raycast(fpsCam.transform.position, fpsCam.transform.forward, out hit, range))
100.         {
101.             Debug.Log(hit.transform.name);
102.  
103.             TargetScript target = hit.transform.GetComponent<TargetScript>();
104.             if (target != null)
105.             {
106.                 target.TakeDamage(damage);
107.  
108.                 //When Chungus Fruit is Destroyed 2 more are spawned.
109.                 Vector3 position1 = new Vector3(Random.Range(-47f, 47f), 10f, Random.Range(-47f, 47f));
110.                 Instantiate(prefab, position1, Quaternion.identity, parent);
111.                 Vector3 position2 = new Vector3(Random.Range(-47f, 47f), 10f, Random.Range(-47f, 47f));
112.                 Instantiate(prefab, position2, Quaternion.identity, parent);
113.             }
114.         }
115.     }
116. }
117.  
118.  

PauseMenu

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class PauseMenu : MonoBehaviour
6. {
7.     public static bool GameIsPaused = false;
8.  
9.     public GameObject pauseMenuUI;
10.  
11.     // Update is called once per frame
12.     void Update()
13.     {
14.         if (Input.GetKeyDown(KeyCode.Escape))
15.         {
16.                 if (GameIsPaused)
17.                 {
18.                     Resume();
19.                 } else
20.                 {
21.                     Pause();
22.                 }
23.            
24.         }
25.     }
26.    
27.     public void Resume ()
28.     {
29.         pauseMenuUI.SetActive(false);
30.         Time.timeScale = 1f;
31.         GameIsPaused = false;
32.  
33.     }
34.  
35.  
36.     void Pause ()
37.     {
38.         pauseMenuUI.SetActive(true);
39.         Time.timeScale = 0.0f;
40.         GameIsPaused = true;
41.     }
42.  
43.     public void QuitGame()
44.     {
45.         Debug.Log("Quit");
46.         Application.Quit();
47.     }
48.  
49. }
50.  
51.  

 

Every script has .enabled property. For your gun script, set it to false when pause menu appears.

 

How would I do this? (Sorry I am new to unity) could you either link me somewhere or write me some script. thanks