I build the game, and what is inside it.

public interface ITurretController
{
    bool TryConsumeAmmo();
    void Recoil();
}

void ProcessFiring()
{
    if (!isFiring) return;
    if (Time.time - lastFireTime < 60 / fireRate) return;

    if (controller.TryConsumeAmmo())
    {
        lastFireTime = Time.time;
        float spread = isAiming ? adsSpread : hipFireSpread;
        float x = Random.Range(-spread, spread);
        float y = Random.Range(-spread, spread);
        Quaternion rot = barrel.rotation * Quaternion.Euler(x, y, 0f);

        Instantiate(bulletPrefab, barrel.position, rot);
        controller.Recoil();
    }
}