var bullet : Transform; //Your bullet prefab. Should have a RigidBody
var speed : float = 10.0f;
var muzzlePoint : Transform; //Your SpawnPoint

function Update() {
    if(Input.GetButtonDown("Jump")) {
        var instance = Instantiate(bullet, Vector3((muzzlePoint.position.x+0.1),muzzlePoint.position.y,muzzlePoint.position.z), muzzlePoint.rotation);

	Destory(instance, 5);
        instance.velocity = muzzlePoint.forward * speed;
    }

 }