problems with particlesystem effect as a bullet tracer

first, i have a script attached to my gun that will instantiate a bullet(which has a script attached to it that handle's the raycasting) gun script:

 if (Input.GetButton("Fire1"))
         {
             fireTime += Time.deltaTime;
             if (waitTilNextFire <= 0)
             {

                 Vector3 fireDirection = bullet.transform.forward;
                 fireRotation = Quaternion.LookRotation(fireDirection);
                 Quaternion randomRotation = Random.rotation;
                 float currentSpread = Mathf.Lerp(0.0f, maxBulletSpreadAngle, fireTime / timeTilMaxSpreadAngle);
                 fireRotation = Quaternion.RotateTowards(fireRotation, randomRotation, Random.Range(0.0f, currentSpread));
 
                 if(bullet)
                     Instantiate(bullet, bulletSpawn.transform.position, bulletSpawn.transform.rotation);
                 if(bulletSound)
                     holdSound = (GameObject) Instantiate(bulletSound, bulletSpawn.transform.position, bulletSpawn.transform.rotation);
 
                 waitTilNextFire = fireSpeed;
 
             }
         }
         else
         {
             fireTime = 0.0f;

         }
         waitTilNextFire -= Time.deltaTime;

this is the part that handle's instantiating the bullet bullet script: RaycastHit hit;

     void Awake()
     {
 
         if (Physics.Raycast(transform.position, WeaponAK.fireRotation * transform.forward, out hit, maxDist))
         {
             Debug.Log ("Physics statementcalled");
             if (decalHitWall && hit.transform.tag == "LevelParts")
             {
                 Debug.Log ("Has Hit the wall");
                 Instantiate(decalHitWall, hit.point + (hit.normal * floatInFrontOfWall), Quaternion.LookRotation(hit.normal));
             }
 
             if (decalHitWall && hit.transform.tag == "Enemy")
             {
                 Debug.Log("hit enemy");
                 NormalZombie normalZombie = hit.collider.GetComponent<NormalZombie>();
                 normalZombie.zombieHealth -= 25;
                 Debug.Log(normalZombie.zombieHealth);
             }
         }
         Destroy(gameObject);
     }

this script fires the ray. (i have bullet spread so the rays wont always point to the same spot if that makes sense)

The problem i have is that i don't know how i should go about adding the particle system so that when i fire the bullet, the particlesystem will fire along the ray. I've tried making the particle system in the first script

ParticleSystem tracer;

then enabling it when i hold down left click, and disabling it when i don't hold down left click

if (Input.GetButton("Fire1")) { fireTime += Time.deltaTime; if (waitTilNextFire <= 0) { tracer.enableEmission = true;

and in the else statement adding

tacer.enableEmission = false;

but when i do this, the particle System never shows in my game. I've tried a looking up how to do this/testing different ways to go about it; but none of them have worked. Can anyone help point me in the right direction?