LineRenderer not working

Im trying to do a laser pointer for the guns of the player ,I dont get any error messages or anything but it doesnt work, debug.drawline works fine, any idea whats happening?

 using UnityEngine;
 using System.Collections;
 
 [AddComponentMenu("Rayco's scripts/Laser")]
 public class laser : MonoBehaviour {
     public GameObject weapon;
     public int LaserLength;
     public Vector3 RotationOffset;
     public Vector3 PositionOffset;
     public Material LaserMaterial;
     public Color LaserColor;
     public Color LaserEndColor;
     public float LaserStartWidth;
     public float LaserEndWidth;
     private Ray ray;
     void Start () {
         LineRenderer lineRenderer = gameObject.AddComponent<LineRenderer>();
         transform.parent = weapon.transform;
         transform.localEulerAngles = RotationOffset;
         transform.localPosition = PositionOffset;
         lineRenderer.material = LaserMaterial;
         lineRenderer.SetColors(LaserColor,LaserEndColor);
         lineRenderer.SetVertexCount(2);
         lineRenderer.SetWidth(LaserStartWidth,LaserEndWidth);
         
     }
     void Update() {
         //LineRenderer
         LineRenderer lineRenderer = GetComponent<LineRenderer>();
         //Raycast stuff
         ray.origin = transform.position;
         ray.direction = transform.forward;
         RaycastHit hit;
         if (Physics.Raycast (ray, out hit, LaserLength)){
         //Debug.DrawLine draws a line on game view, I have it for testing pourposes, you may delete any reference to it
         Debug.DrawLine(ray.origin, hit.point, Color.red);
         lineRenderer.SetPosition(0,ray.origin);
         lineRenderer.SetPosition(1,hit.point);
             
         }
         else{
         Debug.DrawLine(ray.origin,ray.GetPoint(LaserLength), Color.red);
         lineRenderer.SetPosition(0,ray.origin);
         lineRenderer.SetPosition (1, ray.GetPoint(LaserLength));
         }
     }
     
 }