LocalScale doesn't scale sprite to the distance specified

I'm using Unity 5.3.4 for starters. Im trying to implement an extendable lazer but Im running into some problems. I followed this tutorial:

http://steredenn-game.tumblr.com/post/98397504410/steredenn-making-an-expandable-laser

The code I'm using:

if (start == null) { start = (GameObject)Instantiate (rstart); start.transform.parent = this.transform; start.transform.localPosition = Vector2.zero; }

     if (middle == null) 
     {
         middle = (GameObject)Instantiate (rmiddle);
         middle.transform.parent = this.transform;
         middle.transform.localPosition = Vector2.zero;
     }

     currentRailgunSize = maxRailgunSize;
     rDirection = this.transform.right;
     RaycastHit2D hit = Physics2D.Raycast (this.transform.position, rDirection, maxRailgunSize);

     if (hit.collider != null) 
     {
         //we hit something
         currentRailgunSize = Vector2.Distance(hit.point, this.transform.position);

         // -- Create the end sprite
         if (end == null)  
         {
             end = Instantiate(rend) as GameObject;
             end.transform.parent = this.transform;
             end.transform.localPosition = Vector2.zero;
         }
     }
     else
     {
         // Nothing hit
         // -- No more end
         if (end != null) {
             Destroy (end);
         }
     }

     // Place things
     // -- Gather some data
     float startSpriteWidth = start.GetComponent<Renderer>().bounds.size.x;
     float endSpriteWidth = 0f;

     if (end != null) {
         endSpriteWidth = end.GetComponent<Renderer> ().bounds.size.x;  
     }
     // -- the middle is after start and, as it has a center pivot, have a size of half the laser (minus start and end)
     middle.transform.localScale = new Vector3(currentRailgunSize- startSpriteWidth , middle.transform.localScale.y, middle.transform.localScale.z);
     middle.transform.localPosition = new Vector2((currentRailgunSize) /2f, 0f);


     // End? 
     if (end != null)   
     {
         end.transform.localPosition = new Vector2(currentRailgunSize, 0f);    

     }  
      
 } 

However, middle sprite of the laser seems to be scaling slower in comparison to the distance between the hit point and the starting position(local's parent). I even tried this method to get the desired length of the middle sprite:

http://answers.unity3d.com/questions/432009/resizing-a-gameobject-based-on-mouse-position.html

Code modified:

// Place things // -- Gather some data

     float startSpriteWidth = start.GetComponent<Renderer>().bounds.size.x;
     rendererz = middle.GetComponent<Renderer> ();
     float middleSpriteWidth = rendererz.bounds.size.x;
     float endSpriteWidth = 0f;

     if (end != null) {
         endSpriteWidth = end.GetComponent<Renderer> ().bounds.size.x;  
     }
     // -- the middle is after start and, as it has a center pivot, have a size of half the laser (minus start and end)
     middle.transform.localScale = new Vector3(currentRailgunSize/middleSpriteWidth , middle.transform.localScale.y, middle.transform.localScale.z);
     middle.transform.localPosition = new Vector2((currentRailgunSize) /2f, 0f);


     // End? 
     if (end != null)   
     {
         end.transform.localPosition = new Vector2(currentRailgunSize, 0f);    

     }  

but I got this weird effect where the beam would spaz out and return to a shorter length.

So right now I'm looking for any suggestions I can possible get. The tutorial did mention the middle sprite has to be 1 pixel per unit (mine is 100) but when i changed it to 1 pixel per unit it was way too big for the map so I change it back to 100 pixels per unit.

Any thoughts?