[Dúvida] A bala sai girando sem direção.

Quando disparo a bala, ela sai girando sem direção. Qual o problema?

Controle da arma

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BulletControl : MonoBehaviour
{
    public GameObject Bullet;
    public GameObject GunBarrel;
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        if(Input.GetButtonDown("Fire1")){
            Instantiate(Bullet, GunBarrel.transform.position, GunBarrel.transform.rotation);
        }
    }
}

Controle da bala

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Bullet : MonoBehaviour
{
    public float Velocity = 20;

    // Update is called once per frame
void FixedUpdate () 
{
    GetComponent<Rigidbody>().MovePosition (GetComponent<Rigidbody>().position + transform.forward * Velocity * Time.deltaTime);
}
}