Instantiate the same gameobject multiple times at once

Question

So i am trying to create code where by when I shoot, bullets will shoot out of my gun at the same time, from 3 different positions. If I do a singular instantiate, it works fine, like below:

   IEnumerator ShotgunCoolDown()
    {
        PistolGunEffect.SetActive(false);
        canShoot = true;
        yield return new WaitForSeconds(0.45f);
        GetComponent<AudioSource>().PlayOneShot(PistolGunSound);
        canShoot = false;
        StartCoroutine(COPlayOneShot("Fire"));
        RifleGunEffect.GetComponent<ParticleSystem>().Play();
        (Instantiate(PistolBullet, ShotgunPoint.transform.position, transform.root.rotation) as GameObject).GetComponent<BulletScript>().Activate();
        yield return new WaitForSeconds(0.25f);
    }

However if i add multiple instantiates with different positionings, it will spawn the bullet for a millisecond before disappearing:

     IEnumerator ShotgunCoolDown()
        {
            PistolGunEffect.SetActive(false);
            canShoot = true;
            yield return new WaitForSeconds(0.45f);
            GetComponent<AudioSource>().PlayOneShot(PistolGunSound);
            canShoot = false;
            StartCoroutine(COPlayOneShot("Fire"));
            RifleGunEffect.GetComponent<ParticleSystem>().Play();
            (Instantiate(PistolBullet, ShotgunPoint.transform.position, transform.root.rotation) as GameObject).GetComponent<BulletScript>().Activate();
            (Instantiate(PistolBullet, ShotgunPoint1.transform.position, transform.root.rotation) as GameObject).GetComponent<BulletScript>().Activate();
            (Instantiate(PistolBullet, ShotgunPoint2.transform.position, transform.root.rotation) as GameObject).GetComponent<BulletScript>().Activate();             
yield return new WaitForSeconds(0.25f); 
 }

Any ideas how to address this?

Answer 1

It is most probably a problem regarding your bullets being able to collide with bullets. (as noted by the various comments) To solve this, go to Edit -> Project -> Physcis in Unity's menu in the upper left corner. You will see a Layer Collision Matrix. Checking/unchecking boxes enables you to tell the engine which layer can collide with which.

If you have no 'Bullet' layer, create one and then set it up as you wish.