My gun won't fire. ( Javascript )

I built my own gun with blender. I've only been using Unity and Blender for a few days. I watched this video. http://www.youtube.com/watch?v=NPlRbxJtKxE and used a script from this guys comment GyratinVibratinD1LD01 month ago

Heres the script that works . var projectile : Rigidbody; var speed = 10;

function Update () { if (Input.GetButtonUp ("Fire1")) { clone = Instantiate(projectile, transform.position, transform.rotation); clone.velocity = transform.TransformDirection(Vector3 (0, 0, speed));

Destroy (clone.gameObject, 5);

}}

I dragged a sphere into rigidbody for the spawn, which is placed at the muzzle of my gun. The sphere has a physics property of rigidbody. Here's my script.

var projectile : Rigidbody ; var speed = 10;

function update () {

if(Input.GetButtonUp ("Fire1")) { clone = Instantiate(projectile, transform.position, transform.rotation); clone.velocity = transform.TransformDirection(Vector3 (0, 0, speed));

Destroy (clone.gameObject, .25);

}}