transform.lookat not working?

So I have this kinda sentry thing. I set it to look at the player via transform.lookat. Here is the code:

 if (target != null) {
             Vector3 target2;
             if(target.tag=="Player"){
                 target=target.transform.FindChild("Armature").gameObject;
                 target2=new Vector3(target.transform.position.x,0,target.transform.position.y);
             }else{
                 target2=new Vector3(target.transform.position.x,0,target.transform.position.y);
             }
             transform.LookAt (target2);
         }

But when i move around the sentry it barley even moves. Ill be right behind it and it will have only moved like 2 degrees rotation from its origional rotation. A.K.A. Its not tracking/following the player correctly at all. Any help?