Shooting. Bullet floats and sprays

Hi. I know this might sound silly... I've read the FPS tutorial and all sorts of tutorials... But when I shoot, the bullet stays at the spawn point of the gun. And you shoot millions of them as long as you keep holding on the mouse button. Here's my script:

public var bulletPrefab : Transform; public var bulletSpeed : float = 6000;

function Update(){ if(Input.GetButton("Fire1")) { if(!bulletPrefab || !bulletSpeed) { Debug.Log("[Shoot] 'bulletPrefab' or 'bulletSpeed' is undefined"); }else{ var bulletCreate = Instantiate(bulletPrefab, GameObject.Find("SpawnPoint").transform.position, Quaternion.identity); bulletCreate.rigidbody.AddForce(transform.forward * bulletSpeed); } } }

Please help!