Unity - Basic gun controller

GunController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class GunController : MonoBehaviour
{
    public bool isFiring;
    public BulletController bullet;
    public float bulletSpeed;
    public float fireRate;
    private float shotCounter;
    public Transform bulletOrigin;

    void Update()
    {
        /// Instantiate bullets
        if (isFiring)
        {
            shotCounter -= Time.deltaTime;
            if (shotCounter <= 0)
            {
                shotCounter = fireRate;
                BulletController newBullet = Instantiate(bullet, bulletOrigin.position, bulletOrigin.rotation) as BulletController;
                newBullet.speed = bulletSpeed;
            }
        }
        else
        {
            shotCounter = 0;
        }
        ///
    }
}