alternately firing 2 guns C#

[KubaDDK]

Hi, I have a spaceship with 2 guns. I wanted to shoot them alternately. Like that:

So I wrote that script:
public GameObject shot;

void Update () {
	FiringShots ();
}

   void FiringShots(){
	if (Input.GetButton("Fire1") && Time.time > nextFire) {			//firing blasts
		nextFire = Time.time + fireRate;
		Instantiate(shot, shotSpawn.position, shotSpawn.rotation);
	}
	if (Input.GetButton("Fire1") && Time.time > nextFireB) {		//firing blasts B with delay
		nextFireB = Time.time + fireRateB;
		StartCoroutine(InstantiateBShot ());
        }

IEnumerator InstantiateBShot() {
	yield return new WaitForSeconds(0.12f);
	Instantiate(shot, shotSpawnB.position, shotSpawn.rotation);
}

Am I doing it right? I mean it does work, but is using IEnumerator & WaitForSecond function not to much? Is there better option maybe?

[saschandroid]

Something like this should work:

bool m_alternate = false;
void FiringShots()
       {
             if (Input.GetButton("Fire1") && Time.time > nextFire)
             {              
                  nextFire = Time.time + fireRate;
                  m_alternate = !m_alternate;
                  if ( m_alternate )
                  {
                      Instantiate(shot, shotSpawn.position, shotSpawn.rotation);
                  }
                  else
                  {
                      Instantiate(shot, shotSpawnB.position, shotSpawn.rotation);

                  }
             }  
        }