Rocket Launcher Fires Explosion, But Not Rocket

I'm following a tutorial that might be outdated at Noobtuts, so I'm not sure if the mistake is on my end or the site's, but here's my code for the rocket launcher. I get an explosion but no rocket comes out. I disabled collision on the weapon so the missile isn't exploding upon contact with the gun but maybe it still is? I don't know.

Any help would be greatly appreciated! I tried banging my head against the problem but I can't seem to solve it on my own.

The code for the rocket.

 public class Rocket : MonoBehaviour
 {
     // The fly speed (used by the weapon later)
     public float speed = 2000.0f;
 
     // explosion prefab (particles)
     public GameObject explosionPrefab;
 
     // find out when it hit something
     void OnCollisionEnter(Collision c)
     {
         // show an explosion
         // - transform.position because it should be
         //   where the rocket is
         // - Quaternion.identity because it should
         //   have the default rotation
         Instantiate(explosionPrefab,
                     transform.position,
                     Quaternion.identity);
 
         // destroy the rocket
         // note:
         //  Destroy(this) would just destroy the rocket
         //                script attached to it
         //  Destroy(gameObject) destroys the whole thing
         Destroy(gameObject);
     }
 }

The code for the weapon

 public class Shoot : MonoBehaviour {
     // Rocket Prefab
     public GameObject rocketPrefab;
     
 
     // Update is called once per frame
     void Update()
     {
         // Left mouse clicked?
         if (Input.GetMouseButton(0))
         {
             // spawn rocket
             // - Instantiate means 'throw the prefab into the game world'
             // - (GameObject) cast is required because unity is stupid
             // - transform.position because we want to instantiate it exactly
             //   where the weapon is
             // - transform.parent.rotation because the rocket should face the
             //   same direction that the player faces (which is the weapon's
             //   parent. 
             //   we can't just use the weapon's rotation because the weapon is
             //   always rotated like 45° which would make the bullet fly really
             //   weird
             GameObject g = (GameObject)Instantiate(rocketPrefab,
                                                    transform.position,
                                                    transform.parent.rotation);
 
             // make the rocket fly forward by simply calling the rigidbody's
             // AddForce method
             // (requires the rocket to have a rigidbody attached to it)
             float force = g.GetComponent<Rocket>().speed;
             g.GetComponent<Rigidbody>().AddForce(g.transform.forward * force);
         }
     }
 
 }