Gun doesn't shoot straight?

Hello, I just added a new gun in my fps game and I attached the same script to my new gun as to my previous weapons which work fine. I obviously changed the variables so that they fit my new gun, but all the code is the same: var projectilePrefab : Transform; var force : float = 20000; static var mg36clipSize : int = 100; var mg36fullClip : int = 100; var projectile; var font : Font; var scopeCam : Camera;

 function Awake (){
     mg36clipSize = mg36fullClip;
 }
 
 function Update () {
     scopeCam.gameObject.active = false;
     if (Input.GetButton("Fire1") && mg36clipSize > 0){
         mg36clipSize--;
         projectile = Instantiate (projectilePrefab, 
         GameObject.Find("mg36_spawnPoint").transform.position, 
         GameObject.Find ("First Person Controller").transform.rotation);
         projectile.rigidbody.AddForce (projectile.transform.right * force);
         wait();
     }
 }
 
 function OnGUI (){
     GUI.skin.font = font;
     GUI.contentColor = Color.red;
     GUI.Label (Rect (10,600,100,100), "" + mg36clipSize);
 }
  function wait (){
      yield WaitForSeconds (0.2);
  }

However, on this gun, when I shoot the projectile goes off to the side for some reason. Does anyone know how this can be fixed? Thanks a lot, its probably just a really stupid problem but I'm a noob ;)