gun holding

I have had this question before, and I give my answer credit to @aldonaletto

Here is a gun pick up and swap script:

 var hasRocketLauncher = false; // tells if you have a rocket launcher
 var hasMachineGun = false; // tells if you have a machine gun
 var ammoClips = 1; // tells how many ammo clips you have
 var rockets = 10; // tells how many rockets you have
 var Primary : GameObject;
 var Secondary : GameObject;
  
 private var inTrigger = false;
 private var object: Transform;
  
 function OnTriggerEnter(other: Collider){
 inTrigger = true; // the player entered the trigger
 object = other.transform; // save the object transform
 }
  
 function OnTriggerExit(other: Collider){
 inTrigger = false; // the player left the trigger
 }
  
 function Update(){
 // if player inside trigger and F pressed:
  
 if (inTrigger && Input.GetKeyDown("f")){
 switch(object.tag){
 case "MachineGun":
 hasMachineGun = true; // enable switching to the machine gun
 Destroy(object.gameObject); // destroy the picked object
 Primary.SetActiveRecursively(false);
 Secondary.SetActiveRecursively(true);
 if(Input.GetKeyDown("1")){
 Primary.SetActiveRecursively(true);
 Secondary.SetActiveRecursively(false);
 }
 break;
  
 case "RocketLauncher":
 hasRocketLauncher = true; // enable switching to the rocket launcher
 Destroy(object.gameObject); // destroy the object
 break;
 case "AmmoClip":
 ammoClips++; // increment ammo clips
 Destroy(object.gameObject);
 break;
 case "Rocket":
 rockets++; // increment rockets
 Destroy(object.gameObject);
 break;
 }
 }

Here is the link to my question and problems: http://answers.unity3d.com/questions/294476/weapon-pickup-and-change.html