2D Platformer Gun Equip Script Not Working

I have a 2D Platformer game and I have weapons on the ground that I want to be able to pick up. And so I made this script trying to do that and I'm trying to make the gun become a child of the player when it picks the gun up so that I can animate it and so it will follow the player.

Script attached to "Player"

 public class Gun : MonoBehaviour {
 
     public bool equipped = false;
     private GunEquip equip;
 
     Animator a;
 
     void Start()
     {
         a = GetComponent<Animator>();
     }
 
     void OnCollisionEnter2D(Collider2D coll)
     {
         equip = GetComponent<GunEquip>();
 
         if (coll.gameObject.tag=="Pickup" && Input.GetKeyDown(KeyCode.E))
         {
             equipped = true;
             gameObject.GetComponent<GunEquip>().Equip();
         }
     }
 
     void Update()
     {
         if(equipped==true)
         {
             a.SetBool("Equipped", true);
         }
     }
 
     void FixedUpdate()
     {
         a.SetBool("Equipped", equipped);
     }
 }

Script attached to "Gun"

 public class GunEquip : MonoBehaviour {
 
     public void Equip()
     {
         transform.parent.tag = "Player";
     }
 }