[WeaponSystem] - Can't change weapons and instantiated bullets on clients

I'm working on my final college project, it is a fps multiplayer and I made a very simple weapon system that works perfectly locally (for my own purposes). However when trying to convert to multiplayer I can't fix some issues. The first one and most basic in my opinion is I can't switch weapon in all clients. I've tried to use RpcClient and Commant but still no results. Basically, I have a class in the weapon that holds its attribute, including the projectile. From another class (WeaponManager), I set the activeWeapon parameters, including the active projectile (member variable) to be instantiated on the server via [Command]. The thing is, by not using [Command] on "RpcChangeWeapon" method, the instantiated bullet on server is always the same (it not changes), but on client it works fine. Otherwise, If I use [Command] on "RpcChangeWeapon", the instantiated bullet works fine on the server, but in the client the player do not change his weapon .

I would love to get some help, so I can continue my final project :/ Thank you.

public class WeaponManager : NetworkBehaviour {

//Script References
UIManager m_UIManager;
BaseWeapon m_baseWeapon;
ShootNetworkManager m_shootNetworkManager;

//Public variables
public GameObject m_activeWeapon;
public GameObject m_primaryWeapon;
public GameObject m_secondaryWeapon;

public GameObject m_activeBullet;
public Transform m_spawnBullet;


//Private variables
int m_weaponIndex = 0;
float m_cooldown;

//just testing
public float F***ingfirerate = 1f;


void Awake()
{
m_shootNetworkManager = GetComponent<ShootNetworkManager> ();
m_baseWeapon = GetComponentInChildren<BaseWeapon> ();
}


void Start()
{
m_UIManager = GameObject.Find ("PlayerUI").GetComponent<UIManager>();
SetActiveWeapon(m_primaryWeapon);
}

void Update()
{
if (!isLocalPlayer)
return;

if (!m_activeWeapon.GetComponent<BaseWeapon> ().m_isRecharging) {
if (Input.GetKeyDown (KeyCode.Tab)) {
RpcChangeWeapon ();
}
}

m_cooldown -= Time.deltaTime;

if (Input.GetButton ("Fire1") && m_cooldown <= 0f && !m_baseWeapon.m_isRecharging)
CheckBullets();

if (Input.GetKeyDown (KeyCode.R) && !m_baseWeapon.m_isRecharging)
StartCoroutine(Recharge ());

}

void CheckBullets()
{

if (m_baseWeapon.m_loadedBullets > 0) {
CmdFire ();
m_cooldown = m_baseWeapon.m_fireRate;
m_baseWeapon.m_loadedBullets--;
} else {
StartCoroutine(Recharge ());
}
}


[Command]
void CmdFire()
{

// create the bullet object from the bullet prefab
var bullet = (GameObject)Instantiate(
m_activeBullet,
m_spawnBullet.position,
m_spawnBullet.rotation);

// make the bullet move away in front of the player
bullet.GetComponent<Rigidbody>().AddRelativeForce(Vector3.forward * 400f);

NetworkServer.Spawn (bullet);

// make bullet disappear after 2 seconds
Destroy(bullet, 2.0f);
}

IEnumerator Recharge()
{
if (m_baseWeapon.m_remainingBullets > 0) {
m_baseWeapon.m_isRecharging = true;

yield return new WaitForSeconds (m_baseWeapon.m_rechargebleTime);

m_baseWeapon.m_isRecharging = false;
int bulletsNeed = m_baseWeapon.m_maxBulletsPerCartridge - m_baseWeapon.m_loadedBullets;

for (int i = 0; i < bulletsNeed; i++) {

m_baseWeapon.m_remainingBullets--;
m_baseWeapon.m_loadedBullets++;

if (m_baseWeapon.m_remainingBullets <= 0) {
m_baseWeapon.m_remainingBullets = 0;
break;
}
}
}
}

void SetActiveWeapon(GameObject weapon)
{
m_activeWeapon = weapon;
m_baseWeapon = m_activeWeapon.GetComponent<BaseWeapon> ();
m_activeBullet = m_baseWeapon.m_projectile;
m_spawnBullet = m_baseWeapon.m_projectileSpawn;
}

[ClientRpc]
void RpcChangeWeapon()
{

m_weaponIndex++;

switch (m_weaponIndex) {
case 0:
SetActiveWeapon (m_primaryWeapon);
m_primaryWeapon.SetActive (true);
m_secondaryWeapon.SetActive (false);
break;
case 1:
SetActiveWeapon (m_secondaryWeapon);
m_secondaryWeapon.SetActive (true);
m_primaryWeapon.SetActive (false);
break;
}

m_UIManager.SetWeaponUI(m_activeWeapon.GetComponent<BaseWeapon>());

if (m_weaponIndex >= 1)
m_weaponIndex = -1;

}

}