RayCast2D not returning values as expected

Hey all,

I'm having an issue with the RayCast2D. After reading the documentation it should be working, but I can't seem to figure out what I'm doing wrong. The code below is designed to stop the NPC from shooting if there is a wall between it and its target, however its still ignoring the walls completely and just shooting at them. My best guess is that its a logic issue of some kind but I can't figure out whats wrong.

  //Check has line of sight on target
                     RaycastHit2D hit = Physics2D.Raycast(transform.position, transform.right, sleepDistance); //Uses raycast to see whats in front of player
                     if (hit)
                     {
                         if (!hit.collider.transform.CompareTag("Obstacle"))//Checks if wall is not in front of player
                             transform.GetChild(0).SendMessage("fireGun", SendMessageOptions.DontRequireReceiver); //Fires gun if wall is not in front of player
                         else
                             Debug.Log("Cast: " + hit.transform.tag); //Debug to see when wall is in front of player, never triggered.
                     }

I've double checked to make sure the walls are all properly tagged, and that its spelled right and everything.

Any ideas? Thanks in advance.