Creating a FPS in Unity Code

GunController.cs

using UnityEngine;
using System.Collections;

public class GunController : MonoBehaviour {

    //public int gunDamage = 1;
    public float fireRate = 0.25f;
    public float weaponRange = 50f;
    public float hitForce = 100f;
    public Transform gunEnd;

    private Camera fpsCam;
    private WaitForSeconds shotDuration = new WaitForSeconds(0.07f);
    private AudioSource gunAudio;
    private LineRenderer laserLine;
    private float nextFire;

    // Use this for initialization
    void Start () {
        laserLine = GetComponent<LineRenderer>();

        gunAudio = GetComponent<AudioSource>();

        fpsCam = GetComponentInParent<Camera>();
    }
	
	// Update is called once per frame
	void Update () {
        if (Input.GetButtonDown("Fire1") && Time.time > nextFire)
        {
            nextFire = Time.time + fireRate;

            StartCoroutine(ShotEffect());

            Vector3 rayOrigin = fpsCam.ViewportToWorldPoint(new Vector3(0.5f, 0.5f, 0.0f));

            RaycastHit hit;

            laserLine.SetPosition(0, gunEnd.position);

            if (Physics.Raycast(rayOrigin, fpsCam.transform.forward, out hit, weaponRange))
            {
                laserLine.SetPosition(1, hit.point);
                //ShootableBox health = hit.collider.GetComponent<ShootableBox>();

                //if (health != null)
                //{
                //    health.Damage(gunDamage);
                //}

                if (hit.rigidbody != null)
                {
                    hit.rigidbody.AddForce(-hit.normal * hitForce);
                }
            }
            else
            {
                laserLine.SetPosition(1, rayOrigin + (fpsCam.transform.forward * weaponRange));
            }
        }

    }

    private IEnumerator ShotEffect()
    {
        gunAudio.Play();

        laserLine.enabled = true;

        yield return shotDuration;

        laserLine.enabled = false;
    }
}