PhotonNetwork Switching Weapons (network sync)

I am making a FPS Shooter game with the help of PUN (learning it). Now i have made a script "WeaponManager" where i get the Input and sending a RPC (Photon View is on the Weapon GameObject, which is a Child of the PlayerController GameObject) to change the Weapon. My problem is, that if anyone wants to change his weapon, for example scrolls up, then everyone's weapon get changed. I know where the problem is, but i do not know how to solve it. I want that only "my" weapon gets changed, but everyone sees is.

 void Update () {
 
         Debug.Log (currentWeaponName);
             
         if (Input.GetAxis ("Mouse ScrollWheel") < 0) {
             if (currentWeapon + 1 <= maxWeapons) {
                 currentWeapon++;
             } else {
                 currentWeapon = 0;
             }
             GetComponent<PhotonView>().RPC("SelectWeapon", PhotonTargets.All, currentWeapon);
             
         } else if (Input.GetAxis ("Mouse ScrollWheel") > 0) {
             if (currentWeapon - 1 >= 0) {
                 currentWeapon--;
             } else {
             currentWeapon = maxWeapons;
             }
             GetComponent<PhotonView>().RPC("SelectWeapon", PhotonTargets.All, currentWeapon);
             
         }
             
         if (Input.GetKeyDown (KeyCode.Alpha1)) {
             currentWeapon = 0;
             GetComponent<PhotonView>().RPC("SelectWeapon", PhotonTargets.All, currentWeapon);
             
         }
             
         if (Input.GetKeyDown (KeyCode.Alpha2)) {
             currentWeapon = 1;
             GetComponent<PhotonView>().RPC("SelectWeapon", PhotonTargets.All, currentWeapon);
             
         }
             
         if (Input.GetKeyDown (KeyCode.Alpha3)) {
             currentWeapon = 2;
             GetComponent<PhotonView>().RPC("SelectWeapon", PhotonTargets.All, currentWeapon);
             
         }
             
         if (Input.GetKeyDown (KeyCode.Alpha4)) {
             currentWeapon = 3;
             GetComponent<PhotonView>().RPC("SelectWeapon", PhotonTargets.All, currentWeapon);
             
         }
 
         if (currentWeapon == maxWeapons + 1) {
             currentWeapon = 0;
         }
         if (currentWeapon == -1) {
             currentWeapon = maxWeapons;
         }
             
     }
 
     [RPC]
     void SelectWeapon(int index){
         for (int i = 0; i < transform.childCount; i++) {
             if(i == index){
                 transform.GetChild(i).gameObject.SetActive(true);
                 currentWeaponName = transform.GetChild(i).gameObject.name;
             }
             else{
                 transform.GetChild(i).gameObject.SetActive(false);
             }
         }
     }
 

The Weapons GameObject (on which the PhotonView and the WeaponManager Script is applied) has four childs (for four Weapons) which I activate / deactivate in the Select Weapon function.