Weapon Audio Playing When Swapping Guns

I created a gun script allowing my gun to fire as well as a weapon swap script, but when I swap weapons it plays the noise.

 using UnityEngine;
 
 public class WeaponSwap : MonoBehaviour
 {
 
     [SerializeField] int selectedWeapon = 0;
     
     // Start is called before the first frame update
     void Start()
     {
         SelectWeapon();
     }
 
     // Update is called once per frame
     void Update()
     {
 
         int previousSelectedWeapon = selectedWeapon;
 
         if (Input.GetAxis("Mouse ScrollWheel") > 0)
         {
             if (selectedWeapon >= transform.childCount - 1)
                 selectedWeapon = 0;
             else
                 selectedWeapon++;
         }
 
         if (Input.GetAxis("Mouse ScrollWheel") < 0)
         {
             if (selectedWeapon <= 0)
                 selectedWeapon = transform.childCount - 1;
             else
                 selectedWeapon--;
         }
 
         if (Input.GetKeyDown(KeyCode.Alpha1))
         {
             selectedWeapon = 0;
         }
 
         if (Input.GetKeyDown(KeyCode.Alpha2))
         {
             selectedWeapon = 1;
         }
 
         if (previousSelectedWeapon != selectedWeapon)
         {
             SelectWeapon();
         }
     }
 
     void SelectWeapon()
     {
         int i = 0;
         foreach (Transform weapon in transform)
         {
             if (i == selectedWeapon)
                 weapon.gameObject.SetActive(true);
             else
                 weapon.gameObject.SetActive(false);
             i++;
         }
     }
 }
 
 using UnityEngine;
 
 public class Gun : MonoBehaviour
 {
     [SerializeField] float damage = 10f;
     [SerializeField] float range = 100f;
     [SerializeField] float fireRate = 15f;
     [SerializeField] float force = 30f;
 
     [SerializeField] AudioClip fireNoise;
     [SerializeField] Camera fpsCam;
     [SerializeField] ParticleSystem muzzleFlash;
     [SerializeField] GameObject impactEffect;
 
     private float nextTimeToFire = 0f;
     public AudioSource source { get { return GetComponent<AudioSource>(); } }
 
     private void Start()
     {
         gameObject.AddComponent<AudioSource>();
         source.clip = fireNoise;
     }
 
     void Update()
     {
         if (Input.GetButtonDown("Fire1") && Time.time >= nextTimeToFire)
         {
             nextTimeToFire = Time.time + 1f / fireRate;
             Shoot();
             PlaySound();
         }
     }
 
     void Shoot()
     {
         RaycastHit hit;
         muzzleFlash.Play();
         if (Physics.Raycast(fpsCam.transform.position, fpsCam.transform.forward, out hit, range))
         {
 
             Target target = hit.transform.GetComponent<Target>();
             if (target != null)
             {
                 target.TakeDamage(damage);
             }
             GameObject impactGO = Instantiate(impactEffect, hit.point, Quaternion.LookRotation(hit.normal));
             Destroy(impactGO, 2f);
         }
     }
     void PlaySound()
     {
         source.PlayOneShot(fireNoise);
     }
 }
 

I tried removing the PlaySound() from the update but that didn't stop it, so I put it back and tried moving the audio clip selection from start() to update() and that didn't work either.