Play An Audio Clip When An Instantiated Object Collides

[system]

I want to make bullets make a sound when they come in contact with a wall. I instantiate them as a prefab. I have attached a script to the bullet prefab that makes it explode and destroy itself but it doesn't make a sound. I have an audio source attached to my bullet. I have tried many things but I cant seem to get the sound to play. Here is the code :

`var explosion : Transform;

public var sound : AudioClip;

function OnCollisionEnter(collision : Collision) {

    if(collision.gameObject.tag=="Wall"){  
            audio.PlayOneShot(sound);
            Destroy (gameObject);
    Instantiate (explosion, transform.position, transform.rotation);

    }

else {

    audio.PlayOneShot(sound);
    Destroy (gameObject);
    Instantiate (explosion, transform.position, transform.rotation);    

}

'

[MC_HALO]

Hey give this a try :

 var explosion : Transform;

   public var sound : AudioClip;

 function OnCollisionEnter(collision : Collision) {

if(collision.gameObject.tag=="Wall"){  
          AudioSource.PlayClipAtPoint(sound, transform.position);
          Destroy (gameObject);
   Instantiate (explosion, transform.position, transform.rotation);

   }

 else {

   AudioSource.PlayClipAtPoint(sound, transform.position);
   Destroy (gameObject);
    Instantiate (explosion, transform.position, transform.rotation);    

   }

try and see if this works :) if it does not work please let me know thanks :)