How to do Switching Weapon System

Well i'm making an FPS and blah blah...I need more than 1 gun, so, what's the easiest way to do a weapon switching system (C# or JavaScript)? I have my Player Like this: Player > Main Camera > PrimaryWep > M4; Bullet-FirePoint; And my Gun script(Attatched to PrimaryWep, M4 is just the 3D model) works like this:

 #pragma strict
 //Weapon Script
 
 var bullet : GameObject;
 var gunBarrel : Transform;
 var reloadSound : AudioClip;
 var shootSound : AudioClip;
 var emptySound : AudioClip;
 var hudAmmo : GUIText;
 var hudMags : GUIText;
 
 var ammo : int;
 static var mags : int;
 var fireRate : boolean;
 var shootTime : float;
 
 var aimingDownSights : boolean = false;
 
 function Start () {
 
     ammo = 45;
     mags = 225;
     fireRate = true;
     shootTime = 0;
 
 }
 
 function Update () {
 
     hudAmmo.text = "Loaded:" +ammo;
     hudMags.text = "Stored:" +mags;
 
     if(Input.GetButton("Fire1")){
         if(ammo > 0){
             if(shootTime > 0.1) {
                 ammo--;
                 audio.clip = shootSound;
                 audio.Play();
                 Instantiate(bullet,gunBarrel.position,gunBarrel.rotation);
                 shootTime = 0;
                 if(aimingDownSights){
                     animation.Play("ADSAnim3");
                     } else {
                     animation.Play("FireAnim1");
                 }
             }
         }
     }
         
     if(ammo == 0 && !audio.isPlaying){
         audio.clip = emptySound;
         audio.Play();    
         
     }
         
     shootTime += Time.deltaTime;
     
     if(Input.GetKeyDown(KeyCode.R)){
         if(ammo == 0 && mags > 0) {
             audio.clip = reloadSound;
             audio.Play();
             animation.Play("ReloadAnim");
             ammo = ammo + 45;
             mags = mags -45;
         }
     }
 
     if(Input.GetButtonDown("Fire2")){
         aimingDownSights = true;
         animation.Play("ADSAnim1");
     
     }
     
     if(Input.GetButtonUp("Fire2")){
         aimingDownSights = false;
         animation.Play("ADSAnim2");
     }    
 }
 

Well i'm thinking about crating another script like this, but changing the ammo and etc...Also i'll make another Bullet-FirePoint(Position where the bullet is instantiated) and etc...

So what's the easiest way to do this? I was thinking about something like: Inside Main Camera I'll create another empty called SecondaryWep, then i'll attatch the Gun2 script, and put inside another gun model, and the other Bullet-FirePoint...then use "activeSelf" to enable and/or disable the guns when i press 1 or 2...Can someone help me with this script? Also if you know a better way to do this please tell me (and please write the script, if you can)...