Projectile problem

Hi

I need some help please.

So I have a gun and a bullet scripted and linked. If I fire the projectile it only works one way.

When I fire any other direction the bullet unnaturally rotates and drifts to one direction.

Gun Logic :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 
 
 public class GunLogic : MonoBehaviour
 {
     [SerializeField]
     GameObject m_bulletPrefab;
 
     [SerializeField]
     Transform m_bulletSpawnPoint;
 
 
 
 
     // Start is called before the first frame update
     void Start()
     {
 
     }
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetButtonDown("Fire1"))
         {
             if (m_bulletPrefab && m_bulletSpawnPoint)
             {
                 Instantiate(m_bulletPrefab, m_bulletSpawnPoint.position, m_bulletSpawnPoint.rotation * m_bulletPrefab.transform.rotation);
             }
 
         }
     }
 }
 

Bullet Logic :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class BulletLogic : MonoBehaviour
 {
     Rigidbody m_rigidbody;
     float m_bulletSpeed = 10.0f;
 
     // Start is called before the first frame update
     void Start()
     {
         m_rigidbody = GetComponent<Rigidbody>();
         if (m_rigidbody)
         {
 
             m_rigidbody.velocity = transform.up * m_bulletSpeed;
 
         }
     }
 
   
 }