public var bullet : GameObject;
public var shootTurrel : GameObject;
public var bulletSpeed : int;
private var timeShoots : float = 0;

function Update() {
if(Input.GetKey("f"))
BulletShoot();
}

function BulletShoot(){
if(Time.time > timeShoots){
timeShoots = Time.time + 0.5f;
var bulletClone : GameObject;

bulletClone = Instantiate(bullet, shootTurrel.transform.position, shootTurrel.transform.rotation) as GameObject;
Physics.IgnoreCollision(collider, bulletClone.collider);
bulletClone.rigidbody.velocity = shootTurrel.transform.forward*bulletSpeed;
Destroy(bulletClone, 2.0f);
}
}