Particle Effects keep on looping, despite Looping being disabled.

Hey everyone, I am sorry in advance if this isn't the correct forum (please direct me to the correct one if it is not), but I am running into an issue where in my FPS game, whenever I right click to fire my rifle, the muzzle flash continuously fires even when I am not holding down the right button. Looping is disabled and everything. Any help would be greatly appreciated.

Here is my script

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Gun : MonoBehaviour {
4.  
5.     public float damage = 10f;
6.     public float range = 100f;
7.  
8.     public Camera fpsCam;
9.     public ParticleSystem muzzleFlash;
10.     // Update is called once per frame
11.     void Update() {
12.         if (Input.GetButtonDown("Fire1"))
13.         {
14.             Shoot();
15.         }
16.     }
17.  
18.     void Shoot ()
19.     {
20.         muzzleFlash.Play();
21.         RaycastHit hit;
22.         if (Physics.Raycast(fpsCam.transform.position, fpsCam.transform.forward, out hit, range))
23.         {
24.             Debug.Log(hit.transform.name);
25.  
26.           Target target =  hit.transform.GetComponent<Target>();
27.             if (target != null)
28.             {
29.                 target.TakeDamage(damage);
30.             }
31.         }
32.     }
33. }
34.  

Any help is greatly appreciated. Thanks!