Avart Fate with Gun Movement

Hey Guys, i am trying to "inverse" the rotation in this script:

 #pragma strict
 var speed: float = 15; // speed to follow camera
 private var localRot: Quaternion;
 private var curRot: Quaternion;
 
 function Awake(){
     localRot = transform.localRotation; // save initial local rotation
     curRot = transform.rotation;
 }
 
 function LateUpdate(){
 
     // targetRot follows instantly the camera:
     var targetRot = transform.parent.rotation * localRot;
     // curRot follows targetRot with some smoothing delay:
     curRot = Quaternion.Lerp(curRot, targetRot, speed * Time.deltaTime);
     transform.rotation = curRot; // update the actual weapon rotation
 
 }

Why, i am trying to put in a Weapon, and the effect is not the way it would be ( Sorry for my bad english xD )

If you not undstand try to put this script in a weapon and you go undstand. Thanks :D