Gun shop - gun doesn't switch pleaseee help

Hello! I am trying to build a gun shop. on this script, everything is working, the gun itself (its properties i mean) is changing, but the model is not.. this is my script. i have set up the array of gameobjects with guns that have skinned mesh renderers attached to them, but now when i buy a gun, it doesn't delete the default gun (gun number 0), it just puts the gun that i bought next to it, without destroying the default gun. why is this? using UnityEngine; using System.Collections; using UnityEngine.UI;

  public class WeaponButton : MonoBehaviour
  {
  
  
      public GameObject[] weaponObjects;
      public PlayerShooting playerShooting;
      public MoneyManager moneyManager;
  
      public int weaponNumber;
      public Image image;
     // public Text name;
      public Text cost;
      //public Text description;
      public Text alreadyHave;
      public Text purchaseComplete;
      public Text insufficient;
  
    
      public int activeCount;
      public Slider damageSlider;
      public Slider timeSlider;
      
  
      private AudioSource source;
  
    
      // Use this for initialization
      void Start()
      {
  
          
          moneyManager = GameObject.FindGameObjectWithTag("Money").GetComponent<MoneyManager>();
          
  
          source = GetComponent<AudioSource>();
          SetButton();
  
          purchaseComplete.enabled = false;
          alreadyHave.enabled = false;
  
          SwitchWeapon(0);
  
  
  
  
          
      }
  
      void SetButton()
      {
          string costString = playerShooting.weapons[weaponNumber].cost.ToString();
          //name.text = playerShooting.weapons[weaponNumber].name;
          cost.text = "$" + playerShooting.weapons[weaponNumber].cost;
          //description.text = playerShooting.weapons[weaponNumber].description;
          timeSlider.maxValue = 0.7f;
          timeSlider.value = timeSlider.maxValue - playerShooting.weapons[weaponNumber].fireRate;
          damageSlider.value =  playerShooting.weapons[weaponNumber].damage;
          
  
  
          if (playerShooting.weapons[weaponNumber].doHaveit)
          {
              image.color = new Color32(98, 74, 139, 255);
          }
      }
  
      public void BuyItem()
      {
          if(playerShooting.weapons[weaponNumber] == playerShooting.weapons[playerShooting.currentWeapon])
          {
              StartCoroutine(ShowAlreadyHave());
          }
  
          if (playerShooting.weapons[weaponNumber].doHaveit)
          {
  
  
              
              playerShooting.currentWeapon = weaponNumber;
  
              SwitchWeapon(weaponNumber);
  
  
  
  
              StartCoroutine(ShowAlreadyHave());
  
          }
          else if (moneyManager.totalMoney >= playerShooting.weapons[weaponNumber].cost && !playerShooting.weapons[weaponNumber].doHaveit)
          {
  
              
              moneyManager.totalMoney -= playerShooting.weapons[weaponNumber].cost;
              playerShooting.currentWeapon = weaponNumber;
             
              playerShooting.weapons[weaponNumber].doHaveit = true;
  
              SwitchWeapon(weaponNumber);
  
  
              StartCoroutine(ShowPurchase());
              Social.ReportProgress("CgkInf3suvQWEAIQCw", 100.0f, (bool success) => { });
  
  
          }
          else if(moneyManager.totalMoney < playerShooting.weapons[weaponNumber].cost)
          {
              StartCoroutine(ShowInsufficient());
          }
  
  
          
  
      }
  
      IEnumerator ShowAlreadyHave()
      {
          insufficient.enabled = false;
          purchaseComplete.enabled = false;
          alreadyHave.enabled = true;
          yield return new WaitForSeconds(3);
          alreadyHave.enabled = false;
      }
      IEnumerator ShowPurchase()
      {
          insufficient.enabled = false;
          alreadyHave.enabled = false;
          purchaseComplete.enabled = true;
          yield return new WaitForSeconds(3);
          purchaseComplete.enabled = false;
      }
      IEnumerator ShowInsufficient()
      {
          purchaseComplete.enabled = false;
          alreadyHave.enabled = false;
          insufficient.enabled = true;
          yield return new WaitForSeconds(3);
          insufficient.enabled = false;
      }
  
      private void Update()
      {
          if (playerShooting.weapons[weaponNumber].doHaveit)
          {
              image.color = new Color32(255, 255, 255, 255);
          }
  
      }
  
      void SwitchWeapon(int index)
      {
  
          for (int i = 0; i < weaponObjects.Length; i++)
          {
              if (i == index)
              {
                  
                  weaponObjects[i].GetComponent<SkinnedMeshRenderer>().enabled = true;
              }
              else
              {
                  
                  weaponObjects[i].GetComponent<SkinnedMeshRenderer>().enabled = false;
              }
          }
      }
 
  
  }