Aiming Down the Sights Script (HELP)

So I decided to make a script about aiming down the sights, in the Hierarchy I have two arms that are default, and I created arms that make it look like its holding a gun. I disabled the two arms that looked like their holding the guns. In the script I created called "Aim.cs" I put this code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Aim : MonoBehaviour {
 
     //Pistol
     public GameObject aimedpistolhand;
     public GameObject aimedpistolhand1;
     public GameObject aimedpistol;
 
     public GameObject armshand;
     public GameObject armshand1;
     public GameObject pistol;
 
     //AK47
     public GameObject aimedak47hand;
     public GameObject aimedak47hand1;
     public GameObject aimedak47;
 
     public GameObject ak47;
 
     // Use this for initialization
     void Start () {
         aimedpistolhand.SetActive(false);
         aimedpistolhand1.SetActive(false);
         aimedpistol.SetActive(false);
 
         aimedak47hand.SetActive(false);
         aimedak47hand1.SetActive(false);
         aimedak47.SetActive(false);
     }
     
     // Update is called once per frame
     void Update () {
         if(pistol.activeInHierarchy) {
             if (Input.GetMouseButton(1))
             {
                 aimedpistolhand.SetActive(true);
                 aimedpistolhand1.SetActive(true);
                 aimedpistol.SetActive(true);
 
                 armshand.SetActive(false);
                 armshand1.SetActive(false);
                 pistol.SetActive(false);
             }
             else
             {
                 aimedpistolhand.SetActive(false);
                 aimedpistolhand1.SetActive(false);
                 aimedpistol.SetActive(false);
 
                 armshand.SetActive(true);
                 armshand1.SetActive(true);
                 pistol.SetActive(true);
             }
         }
 
         if (ak47.activeInHierarchy)
         {
             if (Input.GetMouseButton(1))
             {
                 aimedak47hand.SetActive(true);
                 aimedak47hand1.SetActive(true);
                 aimedak47.SetActive(true);
 
                 armshand.SetActive(false);
                 armshand1.SetActive(false);
                 ak47.SetActive(false);
             }
             else
             {
                 aimedak47hand.SetActive(false);
                 aimedak47hand1.SetActive(false);
                 aimedak47.SetActive(false);
 
                 armshand.SetActive(true);
                 armshand1.SetActive(true);
                 ak47.SetActive(true);
             }
         }
     }
 }
 

So the code works and everything its just, when I press right click it aims it down the sight, though when I let go of the right click button it does go back to the normal state of the hands. When I remove the line "if(pistol.activeInHierarchy) {" then the code works as I want it so when you release the right click button it goes back to the normal arms. Please help because the "if(pistol.activeInHierarchy) {" needs to be there because I'm obviously going to have multiple weapons that you can aim down the sights with.